Thursday, November 19, 2020

Research on environmental history: 330-year-old poplar tree tells of its life

An epigenetic ageing clock in trees

TECHNICAL UNIVERSITY OF MUNICH (TUM)

Research News

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IMAGE: USING TREES AS A MODEL, RESEARCHERS OF THE TUM AND OF THE UNIVERSITY OF GEORGIA, USA, HAVE SHOWN FOR THE FIRST TIME THAT EPIMUTATIONS ACCUMULATE CONTINUOUSLY THROUGHOUT PLANT DEVELOPMENT AND... view more 

CREDIT: ROBERT SCHMITZ

Epigenetic marks do not change the DNA sequence but can affect the activity of genes. "Although in animals, including humans, these marks are believed to be completely reset in gametes, in plants, they can be stably inherited for many generations," says Frank Johannes, Professor of Population Epigenetics and Epigenomics at the Technical University of Munich (TUM), whose research team has been trying to understand how epimutations arise in plant genomes, how stable they are across generations, and whether they can affect important plant characteristics.

Trees are natural epimutation accumulation systems

"Given their extraordinary longevity, trees act as natural epimutation accumulation systems, and therefore offer unique insights into epigenetic processes over long time-scales," says Professor Johannes. Together with co-senior author Professor Robert J. Schmitz (University of Georgia, USA), who is also a Hans Fisher Fellow at the TUM-IAS, he recently published two companion papers on this topic.

In their studies, the team focused on a 330 year-old poplar tree. By comparing DNA methylation (an important epigenetic mark) of leaves from different branches of the tree, they were able to show that epimutations accumulate continuously as a function of the tree's age. The researchers found that the further apart two leaves are from each other, in terms of developmental time, the more dissimilar their DNA methylation patterns are. From this, the researchers were able to conclude that the rate of somatic epimutations is about 10,000 times higher than the genetic mutation rate in this same tree.

An epigenetic ageing clock in trees?

This discovery led to the intriguing insight that epimutations can serve as a kind of molecular clock to determine the age of a tree. "Only some branches had been dated by counting tree rings, but unfortunately not the main stem. We really needed this information for our analysis, so we decided to treat the total age of the tree as an unknown parameter and let the DNA methylation data of the leaves tell us how old the tree is. This gave an estimate of about 330 years," says Professor Johannes.

The estimate later turned out to be consistent with diameter-based dating of the main stem and with other information on the life history of this particular tree. "This was the first indication that there is something like an epigenetic clock in trees."

A window into the past

The team around Prof. Johannes is now pursuing the question whether environmental changes that trees experience over their long life-times leave epigenetic signatures that can be read and interpreted to learn something about their past.

"Our goal is to integrate historical environmental data with our epigenetic work. We think this may offer a window into the past which can help us to understand how trees have dealt with specific environmental challenges such as droughts and temperature fluctuations. This type of information may be useful when considering the future, particularly in light of global climate change."

CAPTION

Researchers want to correlate data of the environmental history of trees with their epigenetic work to offer a window into the past which can help to understand how trees have dealt with specific environmental challenges such as droughts and temperature fluctuations.

More Information

In an ongoing follow-up project, Frank Johannes is working together with Hans Pretzsch, Professor of Forest Growth and Yield Science (https://www.waldwachstum.wzw.tum.de/en/) at the TUM. His department is heading a European beech experiment in the Steigerwald in Central Germany, where individual trees have been closely observed since their first planting in 1870. Detailed growth and climate data are available for these tress. They have now been investigating if and how the developmental history of these trees can be reconstructed using epigenetic measurements.


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Poplar trees tell scientists of their life

Geoscientists discover Ancestral Puebloans survived from ice melt in New Mexico lava tubes

A lava tube in the El Malpais National Monument yields centuries-old insights of survival in the face of harsh climate change

UNIVERSITY OF SOUTH FLORIDA (USF INNOVATION)

Research News

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IMAGE: ICE DEPOSIT AT THE EL MALPAIS NATIONAL MONUMENT IN NEW MEXICO. view more 

CREDIT: UNIVERSITY OF SOUTH FLORIDA

TAMPA, Fla. (Nov. 18, 2020)- For more than 10,000 years, the people who lived on the arid landscape of modern-day western New Mexico were renowned for their complex societies, unique architecture and early economic and political systems. But surviving in what Spanish explorers would later name El Malpais, or the "bad lands," required ingenuity now being explained for the first time by an international geosciences team led by the University of South Florida.

Exploring an ice-laden lava tube of the El Malpais National Monument and using precisely radiocarbon- dated charcoal found preserved deep in an ice deposit in a lava tube, USF geosciences Professor Bogdan Onac and his team discovered that Ancestral Puebloans survived devastating droughts by traveling deep into the caves to melt ancient ice as a water resource.

Dating back as far as AD 150 to 950, the water gatherers left behind charred material in the cave indicating they started small fires to melt the ice to collect as drinking water or perhaps for religious rituals. Working in collaboration with colleagues from the National Park Service, the University of Minnesota and a research institute from Romania, the team published its discovery in "Scientific Reports."

The droughts are believed to have influenced settlement and subsistence strategies, agricultural intensification, demographic trends and migration of the complex Ancestral Puebloan societies that once inhabited the American Southwest. Researchers claim the discovery from ice deposits presents "unambiguous evidence" of five drought events that impacted Ancestral Puebloan society during those centuries.

"This discovery sheds light on one of the many human-environment interactions in the Southwest at a time when climate change forced people to find water resources in unexpected places," Onac said, noting that the geological conditions that supported the discovery are now threatened by modern climate change.

"The melting cave ice under current climate conditions is both uncovering and threatening a fragile source of paleoenvironmental and archaeological evidence," he added.

Onac specializes in exploring the depths of caves around the world where ice and other geological formations and features provide a window to past sea level and climate conditions and help add important context to today's climate challenges.

Their study focused on a single lava tube amid a 40-mile swatch of treacherous ancient lava flows that host numerous lava tubes, many with significant ice deposits. While archaeologists have suspected that some of the surface trails crisscrossing the lava flows were left by ancient inhabitants searching for water, the research team said their work is the earliest, directly dated proof of water harvesting within the lava tubes of the Southwest.

The study characterizes five drought periods over an 800-year period during which Ancestral Puebloans accessed the cave, whose entrance sits more than 2,200 meters above sea level and has been surveyed at a length of 171 meters long and about 14 meters in depth. The cave contains an ice block that appears to be a remnant of a much larger ice deposit that once filled most of the cave's deepest section. For safety and conservation reasons, the National Park Service is identifying the site only as Cave 29.

In years with normal temperatures, the melting of seasonal ice near cave entrances would leave temporary shallow pools of water that would have been accessible to the Ancestral Puebloans. But when the ice was absent or retreated in warmer and dryer periods, the researchers documented evidence showing that the Ancestral Puebloans repeatedly worked their way to the back of the cave to light small fires to melt the ice block and capture the water.

They left behind charcoal and ash deposits, as well as a Cibola Gray Ware pottery shard that researchers found as they harvested a core of ancient ice from the block. The team believes the Ancestral Puebloans were able to manage smoke within the cave with its natural air circulation system by keeping the fires small.

The discovery was an unexpected one, Onac said. The team's original goal in its journey into the lava tube was to gather samples to reconstruct the paleoclimate using ice deposits, which are slowly but steadily melting.

"I have entered many lava tubes, but this one was special because of the amount of charcoal present on the floor in the deeper part of the cave," he said. "I thought it was an interesting topic, but only once we found charcoal and soot in the ice core that the idea to connect the use of ice as a water resource came to my mind."

Unfortunately, researchers are now racing against the clock as modern climate conditions are causing the cave ice to melt, resulting in the loss of ancient climate data. Onac said he recently received support from the National Science Foundation to continue the research in the lava tubes before the geological evidence disappears.

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Joining in the exploration and research were Dylan S. Parmenter, whose master's degree at USF was on the topic and is now a doctoral student at the University of Minnesota, Steven M. Baumann and Eric Weaver of the National Park Service, and Tiberiu B. Sava of the Horia Hulubei National Institute for Physics and Nuclear Engineering in Romania. The research was funded by the National Park Service and the National Science Foundation.

Teton range glacial ice may have persisted in a dormant state during early Holocene warming

Alpine glacier resilience and Neoglacial fluctuations linked to Holocene snowfall trends in the western US

AMERICAN ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE

Research News

A continuous 10,000-year record of alpine glacier fluctuations in Wyoming's Teton Range suggests that some glacial ice in the western U.S. persisted in a reduced, essentially dormant state during periods of early Holocene warming. The findings challenge the paradigm that all Rocky Mountain glaciers completely disappeared during these warm, dry conditions, instead indicating that they may have taken the form of smaller glaciers covered by debris or caked with rocks, which insulated the lingering ice from the heat. This insight may help scientists better understand how glaciers in the region may respond to future warming. "The long-term survival of glacial ice through warm conditions highlights the potential role of debris-covered glaciers and/or rock glaciers to continue providing ecosystem services into the future, despite unfavorable climatic conditions," says Darren Larsen, the lead author of the study. Retreating glaciers are a hallmark of modern climate change, but due to an incomplete glacial record, little is known about how western U.S. glaciers responded to temperature and precipitation changes thousands of years ago. To construct a continuous record, Larsen and colleagues sampled sediment cores from two lake basins in the Tetons - Delta Lake, a glacial lake basin that provided a complementary record of glacier activity, and other nearby lakes including Surprise Lake, a nonglacial lake basin that provided a record of climate variability. By using accelerator mass spectrometry radiocarbon dating, the researchers developed composite rock layer sequences that documented changes in the glaciers as they endured shifts in climate over ten millennia. While sediment flux and meltwater from the Teton Glacier appeared to decrease during a warm period between about 10,000 and 6,300 years ago, Delta Lake sediments maintained distinctly glacial characteristics that suggest glacial ice remained.

Alzheimer's disease drug may help fight against antibiotic resistance

UNIVERSITY OF QUEENSLAND

Research News

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IMAGE: UQ'S DR DAVID DE OLIVEIRA IN THE LAB, TESTING THE EFFICACY OF PBT2 IN DISRUPTING AND KILLING ANTIBIOTIC-RESISTANT GRAM-NEGATIVE BACTERIA. view more 

CREDIT: THE UNIVERSITY OF QUEENSLAND

An experimental Alzheimer's disease treatment is proving effective at treating some of the most persistent, life-threatening antibiotic-resistant bacteria.

Researchers from The University of Queensland, The University of Melbourne and Griffith University have discovered that the drug called PBT2 is effective at disrupting and killing a class of bacteria - known as Gram-negative bacteria - that cause infections such as pneumonia, bloodstream infections and meningitis.

UQ's Professor Mark Walker said the metal transport drug may offer a last line of defence against some of the world's most difficult to treat superbugs.

"The emergence of antibiotic-resistant superbugs is an urgent threat to human health, undermining the capacity to treat patients with serious infection," Professor Walker said.

"Alternative strategies to treat such multi-drug resistant bacteria are urgently needed.

"Led by UQ's Dr David De Oliveira, our team hypothesised that, by using this experimental Alzheimer's treatment to disrupt the metals inside these bacteria, we would also disrupt their mechanisms of antibiotic resistance.

"This was shown to be the case, with the Alzheimer's drug - combined with the antibiotic polymyxin - successfully tackling antibiotic-resistant superbugs like Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa and Escherichia coli."

Griffith University's Professor Mark von Itzstein AO from the Institute for Glycomics said the new treatment was effective, and offered a range of other benefits.

"Based on its use as an experimental Alzheimer's treatment, there's been a significant amount of solid science done on this drug already," Professor von Itzstein said.

"We know, for example, that clinical studies of PBT2 show that it is safe for use in humans.

"And, given that we've been able to combine it with the antibiotic polymyxin to treat polymyxin-resistant bacteria, we may be able to make other now-ineffective antibiotics become effective again for treating infectious diseases.

"This could resharpen, so to speak, some of the weapons we thought we'd lost in our fight against antibiotic-resistant bacteria."

The University of Melbourne's Associate Professor Christopher McDevitt, from the Peter Doherty Institute for Infection and Immunity (Doherty Institute), said the drug had already proved effective beyond the petri dish.

"Animal studies show that the combination of polymyxin and PBT2 kills polymyxin-resistant bacteria, completely clearing any infection," Associate Professor McDevitt said.

"Hopefully in the not-too-distant future people will be able to access this type of treatment in the clinic.

"New techniques are critical in addressing this building threat to human health, and this treatment is an additional weapon in our arsenal to fight the accelerating threat of antibiotic resistance.

"If these new solutions aren't developed, it's estimated that by 2050, antimicrobial-resistant bacteria will account for more than 10 million deaths per year.

"This new treatment could help turn the tide on antibiotic resistance."

The study is published in Science Translational Medicine (DOI: 10.1126/scitranslmed.abb3791).


Antibiotic resistance genes in three Puerto Rican watersheds after Hurricane Maria

AMERICAN CHEMICAL SOCIETY

Research News

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IMAGE: ARGS WERE LOWER IN NUMBER AND LESS DIVERSE IN THIS RURAL PUERTO RICAN WATERSHED AFTER HURRICANE MARIA THAN IN AN URBAN WATERSHED. view more 

CREDIT: MARIA VIRGINIA RIQUELME

In the aftermath of Hurricane Maria, a category 5 hurricane that made landfall in September 2017, flooding and power outages caused some wastewater treatment plants (WWTPs) to discharge raw sewage into waterways in Puerto Rico. Six months later, researchers monitored antibiotic resistance genes (ARGs) in three Puerto Rican watersheds, finding that the abundance and diversity of ARGs were highest downstream of WWTPs. They report their results in ACS' Environmental Science & Technology.

Flooding can result in contamination of waterways with untreated human waste, and in turn, fecal and pathogenic bacteria. Previous research has linked this contamination to the emergence of antibiotic-resistant bacteria. To help monitor the spread of these potentially harmful microbes in waterways, Benjamin Davis, Maria Virginia Riquelme, Amy Pruden and colleagues wanted to detect and quantify bacterial genes that confer antibiotic resistance in three Puerto Rican watersheds post-Hurricane Maria.

The researchers used a method called shotgun metagenomics DNA sequencing to detect ARGs in river water samples from three watersheds, including samples upstream and downstream of three WWTPs. The researchers found that the abundance and diversity of total ARGs, in particular those that confer resistance to clinically important aminoglycoside and β-lactam antibiotics, were higher downstream of WWTPs compared with upstream. The total ARG abundance was higher in samples from an urban high-impact watershed than from the two other watersheds, which had less human influence. Also, two anthropogenic antibiotic resistance markers -- DNA sequences associated with human impacts to the watershed -- correlated with the abundance of a distinct set of ARGs. Although baseline levels of ARGs in these Puerto Rican watersheds prior to Hurricane Maria are unknown, surveillance methodologies like these could be used to assess future impacts of major storms on the spread of antibiotic resistance, the researchers say.

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The authors acknowledge funding from the National Science Foundation and the U.S. Department of Agriculture.

The paper's abstract will be available on November 18 at 8 a.m. Eastern time here: http://pubs.acs.org/doi/abs/10.1021/acs.est.0c05567

The American Chemical Society (ACS) is a nonprofit organization chartered by the U.S. Congress. ACS' mission is to advance the broader chemistry enterprise and its practitioners for the benefit of Earth and its people. The Society is a global leader in providing access to chemistry-related information and research through its multiple research solutions, peer-reviewed journals, scientific conferences, eBooks and weekly news periodical Chemical & Engineering News. ACS journals are among the most cited, most trusted and most read within the scientific literature; however, ACS itself does not conduct chemical research. As a specialist in scientific information solutions (including SciFinder® and STN®), its CAS division powers global research, discovery and innovation. ACS' main offices are in Washington, D.C., and Columbus, Ohio.

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Starved, stuffed and squandered: Consequences of decades of global nutrition transition

POTSDAM INSTITUTE FOR CLIMATE IMPACT RESEARCH (PIK)

Research News

Just a handful of rice and beans - a part of our world is starved. Hawaiian Pizza and ice-cream - another part of our world is stuffed, throwing away food every day. This gap is likely to worsen, while food waste will increase and pressure on the environment will go up, a new study shows. Researchers from the Potsdam Institute for Climate Impact Research (PIK) assessed the consequences if the current nutrition transition, from scarce starch-based diets towards processed foods and animal products, continues - the calculations combine, for the first time, estimates for under- and overweight, food composition and waste. Their findings provide a startling look ahead: By 2050, more than 4 billion people could be overweight, 1.5 billion of them obese, while 500 million people continue to be underweight.

"If the observed nutrition transition continues, we will not achieve the United Nations goal of eradicating hunger worldwide," explains Benjamin Bodirsky from PIK, lead author of the study just published in Scientific Reports. "At the same time, our future will be characterized by overweight and obesity of mind-blowing magnitude." By 2050, 45 percent of the world's population could be overweight and 16 percent obese - compared to about 29 and 9 percent in 2010. This development is due to the insufficient global distribution of food as well as to the shift from scarcely processed plant-based diets towards unbalanced, affluent diets, where animal protein, sugar and fat displace whole grains and pulses.

And that's not all as Bodirsky underlines: "The increasing waste of food and the rising consumption of animal protein mean that the environmental impact of our agricultural system will spiral out of control. Whether greenhouse gases, nitrogen pollution or deforestation: we are pushing the limits of our planet - and exceed them."

Food systems as driver for greenhouse gas emissions

Crop and grazing land for food production cover about one third of the global land area; our food system is responsible for up to a third of global greenhouse gas emissions. The study projects that - if current trends continue - global food demand will increase by about 50% between 2010 and 2050, the demand for animal products like meat and milk will approximately double, a development that requires more and more land.

"Using the same area of land, we could produce much more plant-based food for humans than animal-based food," explains co-author Alexander Popp, head of PIK's Land Use Management Research Group. "To put it in a very simplistic way: If more people eat more meat, there's less plant-based food for the others - plus we need more land for food production which can lead to forests being cut down. And greenhouse gas emissions rise as a consequence of keeping more animals."

Global food demand: distribution and education are at the heart of the problem

The study provides a first-of-its kind, consistent long-term overview of a continued global nutrition transition from 1965 to 2100, using an open-source model that forecasts how much of food demand can be attributed to factors like population growth, ageing, increasing height, growing body mass index, declining physical activity and increasing food waste. Co-author Prajal Pradhan from PIK explains: "There is enough food in the world - the problem is that the poorest people on our planet have simply not the income to purchase it. And in rich countries, people don't feel the economic and environmental consequences of wasting food." But redistribution alone would not be sufficient, as actually both the poor and the rich eat poorly: There is a lack of knowledge about a healthy way of life and nutrition.

How to trigger an appetite for change?

"Unhealthy diets are the world's largest health risks," co-author Sabine Gabrysch, head of PIK's Research Department on Climate Resilience explains. "While many countries in Asia and Africa currently still struggle with undernutrition and associated health problems, they are increasingly also faced with overweight, and as a consequence, with a rising burden of diabetes, cardiovascular disease and cancer," she adds. The study could provide valuable orientation about the potential development pathway of different countries and regions. It could also support much-needed pro-active policies for a qualitative transition towards sustainable and healthy diets.

Sabine Gabrysch concludes: "We urgently need political measures to create an environment that promotes healthy eating habits. This could include binding regulations that limit the marketing of unhealthy snacks and promote sustainable and healthy meals in schools, hospitals and canteens. A stronger focus on nutrition education is also key, from early education in kindergarten to counseling by medical doctors and nurses. What we eat is of vital importance - both for our own health and that of our planet."

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Article:
Benjamin Leon Bodirsky, Jan Philipp Dietrich, Eleonora Martinelli, Antonia Stenstad, Prajal Pradhan, Sabine Gabrysch, Abhijeet Mishra, Isabelle Weindl, Chantal Le Mouël, Susanne Rolinski, Lavinia Baumstark, Xiaoxi Wang, Jillian L. Waid, Hermann Lotze?Campen, Alexander Popp (2020): The ongoing nutrition transition thwarts long-term targets for food security, public health and environmental protection.
Scientific Reports [DOI: 10.1038/s41598-020-75213-3]

Weblink to the article once it is published:
http://www.nature.com/articles/s41598-020-75213-3

 

Denmark trial measures effectiveness of adding a mask recommendation to other public health measures

Embargoed news from Annals of Internal Medicine

AMERICAN COLLEGE OF PHYSICIANS

Research News

Below please find summaries of new articles that will be published in the next issue of Annals of Internal Medicine. The summaries are not intended to substitute for the full articles as a source of information. This information is under strict embargo and by taking it into possession, media representatives are committing to the terms of the embargo not only on their own behalf, but also on behalf of the organization they represent.


Denmark trial measures effectiveness of adding a mask recommendation to other public health measures for preventing SARS-CoV-2 infection

HD video soundbites of the authors and Annals editors discussing the findings are available to download at http://www.dssimon.com/MM/ACP-danmask.
Abstract: https://www.acpjournals.org/doi/10.7326/M20-6817
Editorial: https://www.acpjournals.org/doi/10.7326/M20-7448
Editorial: https://www.acpjournals.org/doi/10.7326/M20-7499


URLs are live when the embargo lifts

A randomized trial of more than 6,000 participants in Denmark adds new evidence to what is known about whether masks protect the wearer from SARS-CoV-2 infection in a setting where public health measures, including social distancing, are in effect but others are not wearing masks. The DANMASK-19 trial randomized participants to follow those public health measures with or without an additional recommendation to wear a surgical mask when outside the home. Mask use outside of hospitals was uncommon in Denmark at the time. After 1 month of follow-up, 1.8% of participants in the mask group and 2.1% in the control group developed infection. While the evidence excludes a large personal protective effect of mask wearing, it weakly supports lesser degrees of protection, and cannot definitively exclude no effect. The findings are published in Annals of Internal Medicine.

Researchers from Copenhagen University Hospital recruited 6,024 adults who spent at least 3 hours per day outside their homes, whose occupations did not require masks, and who did not have a previous known diagnosis of SARS-CoV-2 infection. Participants were randomized into the mask group or the control group and those in the mask group were given a supply of surgical masks. All participants completed weekly surveys and antibody tests with PCR testing if COVID-19 symptoms developed, and at 1 month. At the conclusion of the trial, infection rates were similar between the two groups.

Of note, Danish authorities did not recommend masks during the study period and their use in the community was uncommon. Public transportation and shops remained open and recommended public health measures included quarantine of persons with SARS-CoV-2 infection, social distancing, limiting the number of people seen, frequent hand hygiene and cleaning, and limited visitors to hospitals and nursing homes.

According to the study authors, their findings offer evidence about the degree of protection mask wearers can anticipate in a setting where others are not wearing masks and where other public health measures, including social distancing, are in effect. The findings, however, should not be used to conclude that a recommendation for everyone to wear masks in the community would not be effective in reducing SARS-CoV-2 infections, because the trial did not test the role of masks in source control (transmission from an infected person to others) of SARS-CoV-2 infection.

The editors of Annals of Internal Medicine chose to publish the DANMASK-19 trial because it is a well-designed study that provides an important piece of evidence to understand the puzzle of how to control the COVID-19 pandemic. They also note that the U.S. Centers for Disease Control recently updated their guidance to acknowledge that masks, when worn by all, may reduce transmission by both source control and personal protection. They say that the DANMASK-19 trial does not conflict with these guidelines, but shows that any contribution to risk reduction through personal protection is likely to be less than through source control.

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Media contacts: For an embargoed PDF or to speak with an editor of Annals of Internal Medicine, please contact Angela Collom at acollom@acponline.org. The corresponding author, Henning Bundgaard, DMSc, can be reached through Marianne Uldall Jepsen at marianne.uldall.jepsen@regionh.dk.

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Using materials efficiently can substantially cut greenhouse gas emissions

New report details how societies can cut their GHG emissions by ride- and car-sharing, building smaller houses.

NORWEGIAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Research News

How much can society gain by cutting consumption of materials --  by using materials smarter, using less or recycling materials? A new report from the International Resource Panel for the United Nations Environmental Programme (UNEP) says the gains are substantial and can be key to enabling countries to meet their emissions targets.

The International Resource Panel (IRP) Report, Resource Efficiency and Climate Change: Material Efficiency Strategies for a Low-Carbon Future is the first comprehensive scientific analysis of potential GHG emission savings from material efficiency. The report, for which Edgar Hertwich, International Chair in Industrial Ecology at the Norwegian University of Science and Technology was a lead author, focused on two carbon-intensive sectors: residential buildings and passenger vehicles.

"Materials are ignored by climate policy, yet emissions from the production of materials production have grown fast!" says Hertwich. "If you are concerned about eating meat or flying on airplanes because of your carbon footprint, you should also be even more worried about cement and steel."

The researchers found that 80% of emissions from the production of materials come from the construction and manufacturing sectors, in particular from our homes and cars.

Applying material efficiency strategies can reduce GHG emissions from the life-cycle of construction, operation, and deconstruction of homes by an average of 40% in seven major developed countries - Canada, France, Germany, Italy, Japan, the United Kingdom and the United States (G7 countries) and by 70% in China and India, the researchers found.

It can also reduce GHG emissions from the manufacturing, operations and end-of-life management of cars by 40% in the G7 and by 35% in China and India.

"This report makes it clear that natural resources are vital for our well-being, our housing, our transportation and our food. Their efficient use is central to a future with universal access to sustainable and affordable energy sources, emissions-neutral infrastructure and buildings, zero-emission transport systems, energy-efficient industries and low-waste societies. The strategies highlighted in this report can play a big part in making this future a reality," said Inger Andersen, Executive Director of the UNEP, in a press release.

The Intergovernmental Panel on Climate Change, the IPCC, has proposed a carbon budget under which the G7 would need to limit their remaining CO2 emissions to 50 gigatons for global average temperature increases to stay at 1.5°C.

The IRP estimates that 23 gigatons of emissions could be saved in the G7 through material efficiency strategies in 2016-2060. The IRP report found that the most promising strategy comes from the consumption side - which would involve more intensive use.

"We were not sure society could live with less materials. Our study show it can: we can easily reduce the amount of primary materials required for a reasonably comfortable living through a combination of less materialistic lifestyles and smarter technologies," says Hertwich.

For cars, this means ride-sharing, car-sharing and a shift towards smaller vehicle sizes. If one in four journeys in the G7, China or India was a shared ride, then the carbon footprint of the use and production of cars would decline by as much as 20%.

For homes, more intensive use means increasing use rates through, for example, peer-lodging, or smaller and more efficiently designed homes. IRP modelling shows that reducing demand for floor space by up to 20% could lower GHG emissions from the production of materials by up to 73% in 2050.

"Limiting the growth in the size of our homes, and sharing rides and vehicles turned out to be the most effective ways to reduce emissions," says Hertwich.

Other material efficiency strategies to be considered include the recycling of building materials, less material by design in both cars and homes, and the use of alternative low-carbon materials (for example, sustainably sourced wood instead of reinforced concrete in homes).

"Climate mitigation efforts have traditionally focused on enhancing energy efficiency and accelerating the transition to renewables. While this is still key, this report shows that material efficiency can also deliver big gains," Andersen, UNEP's Executive Director, said.

The cuts revealed by the report are on top of emission savings generated by the decarbonization of electricity supply, the electrification of home energy use, and the shift towards electric and hybrid vehicles. If the world focuses on energy efficiency without boosting material efficiency, it will be almost impossible and substantially more expensive to meet the Paris climate targets, the report warns.

The report notes that the only way to make many of these kinds of emissions reductions is if countries themselves create enabling policy environments and incentives.

The strongest effect comes from policies that apply across sectors, such as building certification, green public procurement, virgin material taxes, and removal of virgin material subsidies.

The IRP report urges policymakers to consider resource efficiency and materials in the next generation of their Nationally Determined Contributions (NDCs),  broadening the scope of targets and increasing the magnitude of the intended mitigation ambition.

Some countries have started doing this, as described in the Resource Efficiency and Climate report. For example, China's NDC specifically mentions a commitment to the efficient use of materials. It includes measures aimed at improving the efficiency and lifespan of existing and new buildings and promoting recycled construction materials.

Japan's NDC includes a commitment to use blended cement, while India's NDC refers to recycling, "enhanced resources efficiency and pollution control" (in addition to energy efficiency) and the general need to "use natural resources wisely."

"There will be no progress until policy makers turn their attention to this issue," says Hertwich. "Unfortunately, many countries have policies in place that inadvertently increase the use of materials, such as through tax breaks for home ownership. Such policies favour the wealthy and increase material use, so revising them creates a win-win situation."

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Source:  IRP (2020). Resource Efficiency and Climate Change: Material Efficiency Strategies for a Low-Carbon Future. Hertwich, E., Lifset, R., Pauliuk, S., Heeren, N. A report of the International Resource Panel. United Nations Environment Programme, Nairobi, Kenya.

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Mining and megaprojects emerge as alarming threat to tropical forests and biodiversity

Companies, governments and investors are pushing through mining and infrastructure projects, setting the stage for rapid and unsustainable development that will harm forests, wildlife and people--and stoke conflict

MINING COMPANIES ARE LISTED ON THE TSX

IN CANADA

NEW YORK DECLARATION ON FORESTS ASSESSMENT PARTNERS

Research News

Washington, DC//Berlin, Germany (19 November 2020)--A new study assessing progress on global efforts to end forest loss worldwide offers the most comprehensive overview to date of the large role that infrastructure and mining play in tropical deforestation, now and in the future. The study finds that an increasing number of megaprojects--massive and complex development projects that may combine transportation, energy and other infrastructure--planned for tropical forests are on track to destroy forests and open remote forested areas to even more development. In particular, this new infrastructure is on track to increase mining activity deeper in the remote forests of South America, Southeast Asia and Central Africa.

"Forests, forest peoples and wildlife, already at a breaking point, are increasingly in the crosshairs of large infrastructure and mining developments," said Franziska Haupt, Berlin executive director of Climate Focus and the lead author of a new report by the NYDF Assessment Partners, Progress on the New York Declaration on Forests: Balancing forests and development: Addressing infrastructure and extractive industries, promoting sustainable livelihoods.

"Big new projects underway or planned in the Amazon, Indonesia, Mesoamerica, the Congo Basin and beyond reveal that our insatiable appetite for coal, minerals, metals, energy and agricultural commodities like soy has opened up a new front in the battle to protect the world's forests," Haupt added. "Some governments are compounding this threat and rolling back forest protections, as countries struggle to cope with the economic fallout of COVID-19."

Released six years after the launch of the New York Declaration on Forests, a pledge to halve deforestation by 2020 and end it by 2030, the report finds that the 2020 target of halving deforestation will not be met and that meeting the 2030 target of ending deforestation will require an unprecedented reduction in the rate of annual forest loss.

The report is also the first study of its kind to describe the full extent of a pan-tropical trend that sees companies, governments, investors and other actors greenlighting damaging mining and infrastructure projects behind closed doors, while failing to factor in the climate, economic, social and environmental value of forests through effective forest and biodiversity policies. The report also looks at the role that civil society and Indigenous and local communities play in pushing back against these trends.

"Many of these projects would never get the green light, if the true value of forests was factored in--their role in reducing climate change, protecting animal habitats and reducing the spread of zoonotic diseases, keeping water sources clean, providing economic opportunity and a long list of other benefits without a price tag," said co-author and coordinator of the report, Erin D. Matson, a senior consultant at Climate Focus.

In the Pipeline

Economic corridor megaprojects, which link roads, waterways and railways with natural resource extraction, and megadams are planned or under development in most remaining critical tropical forest regions, including South America, Sub-Saharan Africa, Indonesian Borneo and Papua and the Mekong.

  • Across five Amazon countries (Bolivia, Brazil, Colombia, Peru and Ecuador), governments are investing a total of US$27 billion over the next five years to construct or update more than 12,000 kilometers (7,456 miles) of roads. If all planned projects are realized, they will cause the deforestation of approximately 2.4 million hectares over the next 20 years.
  • In Indonesia, the Trans-Papua Highway--a 4,000-kilometer network--will cut through Lorentz National Park, increasing access to over 50,000 hectares of mining concessions inside the park.
  • A railway planned for Kalimantan, Indonesia, would open areas for coal mining and palm oil production. And in neighboring Papua New Guinea, two plans in process would double the length of the country's road network by late 2022.
  • In Sub-Saharan Africa, there is an infrastructure boom organized around dozens of international development corridors to extract, transport and export minerals and energy. These corridors, spanning nations, would cut across 400 protected areas and degrade an additional 1,800.

"The proper analysis of forest impact--a Forest Impact Analysis--for large infrastructure projects remains a major challenge," said reporter contributor Arild Angelsen, a senior associate at the Center for International Forestry Research (CIFOR) and a professor of economics at the Norwegian University of Life Sciences (NMBU). "The overwhelming importance of new infrastructure, and roadmaps in particular, to properly evaluate the fate of forests should make this a top public policy priority."

Mining projects across the tropics are also in operation, with coal mining the most damaging. Studies have shown that deforestation for coal mining delivers a "double whammy" of harmful emissions: Ripping up forests and then producing and burning coal release carbon. Furthermore, the report points out that mining is the world's most violent economic sector, with the largest proportion of reported environmental conflicts in the Environmental Justice Atlas, at 21%, and the most associated murders of environmental defenders--50 in 2019.

A survey conducted as part of the report of mining companies reveals that industry-wide action on biodiversity is lagging, with only a handful of companies reporting they have robust biodiversity policies in place and even less evidence that policies are being put into practice.

"Forests are at a dangerous tipping point, and these new large-scale infrastructure projects and extractive developments could push us over the edge and undermine global efforts to stop deforestation. There's a very small--and closing--window of opportunity now to rethink and reorient these projects in a more sustainable direction. Governments, companies and investors all need to step up, commit to more transparency and act quickly to avoid further harm to people, wildlife and nature," said Matson.

Roads to Deforestation

The report reveals that an unchecked rise in transportation networks is poised to do the most damage to forests. Studies show these roads and networks make it easier for loggers, farmers and others responsible for legally and illegally chopping down trees to access forests. Right now, roadways are responsible for 9% to 17% of tropical and subtropical deforestation, with most new deforestation occurring within one kilometer of a road.

"People need improved access, but these are not highways designed to prioritize linking communities to health care, other essential services or economic opportunities. Rather, their purpose is to facilitate the movement of commodities and to make it easier and cheaper to extract natural capital in ways that benefit economic elites above all. Meanwhile, they unleash a Pandora's box of potential forest damage that does harm to local peoples and biodiversity," said Anthony Bebbington, a leading researcher on extractives and infrastructure and a report co-author. "These road projects are, in turn, part of much more extensive networks of waterways, railways, ports and logistics centers that dramatically increase the likelihood of future deforestation by making once remote forested areas accessible to investment."

In Indonesian Papua and the Congo Basin, road networks have increased by over 40% since the early 2000s. These roads and infrastructure often lead to illegal or unchecked activities that can have significantly higher impacts on forests. In Brazil, for every kilometer of legal road, there are an estimated three kilometers of illegal roads. This also leads to increased contact between humans and wild animals, which is a major contributor to the spread of new zoonotic diseases like COVID-19.

Commitments to Nowhere

The report includes the results of the first-ever survey by CDP, a New York Declaration on Forests Assessment Partner, on the status of the corporate biodiversity commitments of metal, mining and coal companies operating in forested areas. Of some 225 companies invited to report on their efforts, only 23 responded. CDP analyzed an additional 22 companies to provide an analysis of 45 key companies operating in tropical regions.

"There are some signs of progress--more than three-quarters of companies we assessed have made a biodiversity-related commitment," said Morgan Gillespy, Global Director of Forests at CDP, the nonprofit that spearheaded forest-related disclosures of metals and mining companies. Most surveyed companies also indicated that biodiversity or the environment are considered at the highest levels, by their boards or at the senior management level.

"But more work needs to be done," Gillespy said. "Only about a third of companies disclosed details of their biodiversity offset projects, and few shared clear and specific targets for action. Extractive companies, and governments as well, must step up their game by improving transparency and implementing management plans that protect forests."

The report supports findings from other recent studies that high-level corporate commitments among mining companies have not always translated into action at the project level. In fact, several of the stronger commitments were paired with poor practices on the ground. A 2019 World Bank analysis of 29 case study sites of large-scale mining in forests could not find a single example of a mining operation that comprehensively addressed and mitigated forest risks.

"This is a salutary reminder that we are living in a dreamworld of pledges, but a reality of little progress, lack of transparency, vested interests and short-termism," said Robert Nasi, Director General of CIFOR. "Alas, reality will always catch us up."

Barriers to progress include the imbalance of power between, on the one hand, governments and companies that prioritize forest destruction over protection, and, on the other hand, Indigenous and local communities eager to keep forests standing. Government-level barriers include difficulties in implementing existing forest policies due to lack of political will, capacity and stability--and the powerful influence of industry actors. At the corporate level, there is a lack of independent verification of company-reported data on progress, a wide variety and lack of common definitions and norms across mining and limited incorporation of local communities in monitoring efforts.

"Even more fundamental is the absence of meaningful consultation processes to obtain the consent of the affected Indigenous, Afro descendant and local peoples who play such critical roles as forest stewards. Taken together, these barriers constitute profound obstacles to, and failures of, accountability and transparency," Bebbington said.

The report also offers new CDP survey results from 200 state and regional governments about the extent to which mining leads to deforestation in their jurisdictions and their responses to this destruction. Some 21 respondents representing subnational forest states in Latin America and Southeast Asia asserted that mining and infrastructure are a cause of deforestation in their regions and have adopted policies to regulate this activity. But few have translated these policies into concrete forest management plans or systematically assessed their forest risks.

"The solutions to deforestation driven by extractive industries and infrastructure are available, but they are still not being implemented at scale" said Alison Hoare, a senior research fellow at Chatham House and a report co-author.

"This will remain the case unless the full environmental impacts of these sectors are integrated into the decision-making of investors and consumers," Hoare added. "In turn, this would help to open up space for governments to consult with their national stakeholders and to properly consider all options for land-use."

Rollbacks and the Way Forward

In addition, national and local governments have made a series of rollbacks, sometimes using COVID-19 as a justification. Throughout the Amazon, Indigenous communities have suffered sustained violence and threats, including the murder of Indigenous leaders, by groups of small-scale, informal miners. The Brazilian government's decisions to open Indigenous territory to industrial mining and to legalize small-scale mining on Indigenous lands threaten communities further. In Indonesia, a May 2020 law gave mining companies greater freedoms, setting the stage for them to open new mining territory and ramp up exploration activity.

Pulling together all these insights, the report lays out four complementary strategies for reducing the threat that infrastructure and mining pose to forests:

  • Embrace alternative development pathways that reduce over-exploitation, inefficient production and excessive consumption of resources;
  • Align macroeconomic and strategic planning with forest protection goals;
  • Fully assess potential negative forest impacts of new infrastructure and mining projects and devise strategies for minimizing them; and
  • Recognize and account for local communities, and devise ways to promote sustainable livelihoods and address deforestation.

"We're seeing trends playing out across forest nations fueled by decisions at the highest levels. By making way for other drivers of deforestation, infrastructure and mining together pose perhaps the greatest threat to forests and biodiversity," Haupt said. "But with these four strategies, we see a path forward that can realize the full social, economic and environmental benefits of development."