To address environmental issues, society needs a deeper understanding of the natural world, and the ways we can regulate our own behavior. Faculty and students at F&ES conduct research in eight broadly conceived areas of environmental concern – biodiversity, forestry, global climate, industry, law and economics, urban systems, water, and social ecology. The scope of these programs reflects not just the complexity of human interaction with the environment, but the fact that the easy answers have been exhausted. As such, it is the mission of the F&ES faculty and students to conduct research that uncovers new knowledge, unique insights, and approaches that tie many fields together. This mission is further carried out by communicating the results of this research to the widest possible audience through publication, lectures, and other educational programs.
F&ES Research News
New Project Funding: Mark Bradford
Understanding local controls on wood decomposition in a regional context
PI: Mark Bradford
Sponsor: National Science Foundation $149,901
Summary: A critical determinant of the carbon balance of forests is the rate at which dead wood decays. This is determined by the rate at which dead wood is formed and the rate at which it breaks down, or decomposes. Dead wood is also a hotspot for other nutrients to accumulate and it is a home for many species of animals, plants and microbes. Because trees contain a lot of carbon, our understanding of how the carbon cycle might be changing requires a better understanding of the wood decomposition process. With that in mind, this project will decompose logs from five common US tree species across a gradient spanning northeastern to southeastern US temperate forests. Potential controls on wood decomposition rates will be manipulated experimentally, such as the density of dead wood and the types of wood-decomposing fungi growing on the logs. Other factors, such as soil nutrient content, temperature and moisture will be monitored. The tree logs will be collected after a year of decay in the field and brought into the laboratory to assess their decomposition extent and associated wood-decaying fungi. The data will then be analyzed to determine wood decomposition rates under the different conditions. Information from this project will be used to refine predictions of carbon-cycle changes and the effects of environmental change on forests. The results will also provide guidance to the forest industry on management of dead wood stocks in forest. The importance of natural wood decay will be communicated through a collaborative effort with the Peabody Museum of Natural History, by creating "living" dead wood exhibits for public display and use in educating visiting middle-school students.
New Project Funding: Liza Comita
Collaborative Research: Genetic diversity, resistance genes, and negative density dependence in tropical tree seedling dynamics
Yale PI: Liza Comita, in collaboration with PI James Marden and Co-PI Claude dePamphilis (Penn State), and PI Scott Mangan (Washington Univ/STRI)
Sponsor: National Science Foundation $158,545
Summary: Negative density dependence (NDD), i.e., reduced growth or survival with increasing densities
of conspecific neighbors, has long been recognized to play a role in maintaining diversity
in species rich communities, such as tropical forests. Recent studies have revealed that NDD
is also related to species abundances within local communities. Specifically, locally rare
tree species suffer more from the density and proximity of conspecific neighbors than common
species, primarily due to attack by host-specific soil pathogens. This project will test a
novel hypothesis to explain this pattern: rare species suffer stronger negative conspecific
effects because they have reduced polymorphism at the local population and seedling cohort
level in their resistance (R) genes. The rationale is that rare species are likely to have
experienced genetic bottlenecks, inbreeding, drift, and have fewer pollen donors, all of which
can reduce the genetic diversity of their offspring, including critical R genes, which undergo
diversifying selection. Thus, seedling cohorts of rare species, being more homogeneous in
R gene alleles, are likely to be co-susceptible to more pathogens (and the neighbors that
harbor and spread them) than common species, which would in turn serve to keep them rare.
We will test this hypothesis in an intensively studied forest on Barro Colorado Island (BCI),
Panama using an integrated combination of transcriptomics, experimental studies of pathogen-mediated
seedling mortality, and spatially explicit simulations to examine effects of distance and
genetic similarity on disease transmission.
New Project Funding: Xuhui Lee
Deuterium Excess of Water Vapor in the Atmospheric Boundary Layer
PI: Xuhui Lee
Sponsor: National Science Foundation $467,517
Summary: This research will explore the utility of water vapor isotope observations for attribution of vapor to remote source regions, local influences and transport in the atmospheric boundary layer (ABL). The emphasis is on “deuterium excess” (dx) of water vapor, a measure of the relative abundance of the D and 18O isotopologues of water. The research methodology consists of data analysis and ABL modeling. The dx data are hourly observations made with laser-based instruments in 11 climate zones in North America and in Asia. An isotopic land surface model will be used to quantify local evapotranspiration effects on the observed variations in dx. Equilibrium boundary layer calculations and large-eddy simulations will be used to infer the dx signal of the vapor in the free atmosphere and its entrainment effect on the ABL dx. Trajectory analysis will identify contributions from remote source regions. The project will yield new isotopic constraints on the linkage between the atmospheric and the land branches of the hydrological cycle.
New Project Funding: Peter Raymond
Collaborative Research: Linking microbial diversity, gene expression, and the transformation of terrestrial organic matter in major U.S. rivers
Yale PI: Peter Raymond, in collaboration with PI Byron Crump (Oregon State), Co-PI George Aiken (USGS), and PI Aron Stubbins (Univ. of Georgia)
Sponsor: National Science Foundation $293,972
Summary: Rivers are the principle conduits between the major global organic carbon stores on land and those in the ocean. Dissolved organic matter (DOM) is a master variable in rivers, impacting light attenuation, metal transport, and metabolism. Riverine bacteria rely on DOM for sustenance and, in using DOM, respire a fraction and alter the composition of the remaining DOM. The relationship between microbes and DOM is a crucial but poorly understood shaper of river ecosystem function. One major gap is our understanding of specific metabolic capabilities of bacteria and how they interact with organic matter quality to carry out the key ecosystem function of transforming and metabolizing riverborne DOM. Integrating new and cutting-edge tools in genetics and DOM geochemistry, this project will describe in molecular detail the ecological and genetic mechanisms by which terrestrial DOM is modified and mineralized to carbon dioxide during transport from land to sea by determining the interactions and feedbacks between microbial functional diversity, gene expression, and DOM metabolism in U.S. rivers.
New Project Funding: Jennifer Marlon & Anthony Leiserowitz
Collaborative Research: Multi-scale Modeling of Public Perceptions of Heat Wave Risk
Yale Co-PIs: Jennifer Marlon and Anthony Leiserowitz, in collaboration with PI Peter Howe (Utah State)
Sponsor: National Science Foundation $223,141
Summary: This project will investigate how personal experience and local context shapes risk perceptions and responses to heat waves. Extreme heat events are currently the leading weather-related cause of death in the U.S. and have numerous impacts on vital social systems including food, water, energy and infrastructure. Extreme heat events are also projected to become more frequent and intense over the 21st century. It is vital to understand how both the public at large and vulnerable populations perceive the risks of extreme heat, how they decide to take action to mitigate these risks, and how their prior experiences shape future responses. This project will collect nationally representative survey data on heat wave risk perceptions, develop a multilevel model to identify individual and socio-environmental predictors of risk perceptions, and implement the model to map risk perceptions across the U.S.
Develop a Pilot-Integrated Forest Landscape and Livelihood Management Tool for REDD+ in India
PI: Alark Saxena; Co-PI: Chad Oliver
Sponsor: Tetra Tech ARD (Prime: USAID) $61,250
Summary: The final deliverable through this contract is a pilot (Proof of concept) Integrated Forest Landscape and Livelihood Management System (ILLMS) that will be responsive to stakeholders’ requirements, and tested in application in Madhya Pradesh Forest-PLUS landscapes in India. The Pilot integrated tool will be able to demonstrate the temporal growth and dynamics of forests in the area. It will also be able to model the consequences of different forest management policy options from forest carbon, bio-diversity and household livelihood point of view. If the concept does prove useful and feasible Forest-PLUS may support further steps to deploy ILLMS in other landscapes in India, to provide training in its use in SFDs, and to institutionalize ILLMS in forestry practice and management.
New Project Funding: Arthur Middleton
Wiggins Fork Elk Herd Migration Study
PI: Arthur Middleton, Postdoctoral Fellow
Sponsor: U.S. Forest Service - Shoshone National Forest $16,547
Summary: Middleton is currently conducting a study of elk migration across the Greater Yellowstone Ecosystem (GYE). The study relies mostly on the analysis of existing data from GPS collared elk, which are available for all but one of the major elk herds in the GYE. No GPS collar data exists for the Wiggins Fork elk herd, which summers largely on the Shoshone and Bridger-Teton National Forests and migrates to mixed-ownership winter ranges near Dubois, Wyoming. This is the one elk herd in the GYE for which fine scale spatial and temporal information on migration are not available. The goal of this project is to capture approximately 15 elk from the Wiggins Fork herd on their winter range, and then instrument them with GPS collars capable of gathering fine scale movement data for two years. This work will complete the dataset needed for the ecosystem-wide analysis of elk migration.
New Project Funding: Marian Chertow
The Fourth Symposium on Industrial Ecology for Young Professionals (SIEYP IV)
PI: Marian Chertow
Sponsor: National Science Foundation $49,775
Summary: Funding will support the fourth Symposium on Industrial Ecology for Young Professionals (SIEYP IV), to be held in Surrey, UK on July 11, 2015. Following the first three symposiums on Industrial Ecology for Young Professionals in 2009, 2011, and 2013, SIEYP IV is to be held in connection and immediately following the biannual International Society for Industrial Ecology (ISIE) conference, and is planned, organized, and attended by students and young professionals. It aims at promoting communication among graduate students and post-doctoral researchers in industrial ecology (IE) about their research, ideas, and experiences. This project is organized by the Student Chapter of the International Society for Industrial Ecology in an effort to encourage and financially support participation by students and post-doctoral researchers in the symposium and the ISIE 2015 Conference immediately preceding it. The theme of SIEYP IV is "Envisioning Future Agendas in Industrial Ecology", reflecting the themes and objectives of the biannual ISIE conference it follows.
New Project Funding: Karen Seto
Synthesis of LCLUC studies on Urbanization: State of the Art, Gaps in Knowledge, and New Directions for Remote Sensing Science
PI: Karen Seto
Sponsor: National Aeronautics and Space Administration $779,991
Summary: The overarching goal of the proposed research is to formulate an assessment of the patterns, drivers, and outcomes of global urban LCLUC from 1972 to 2014 by synthesizing existing remote sensing research and published studies from around the world. We aim to assess how the myriad urban remote sensing studies contribute to advancing fundamental and theoretical knowledge of urbanization, sustainability, and the functioning of the Earth system. This synthesis project will examine five key research questions. Question 1. What are the existing and available remotely sensed datasets and analyses on urban LCLUC? Question 2. What are the available change detection algorithms to characterize urban LCLUC and can we develop best practices to guide which change detection algorithms to apply across different geographies, conditions, and applications? Question 3. What are spatial patterns of urban LCLUC and how do they vary across place, time, and economic development levels? Question 4. What are the socioeconomic and policy drivers of urban LCLUC across different world regions, stages of economic development, and land use histories? Question 5. What are the effects of urban LCLUC on other land uses and land covers?
New Project Funding: James Saiers
RAPID, GOALI: Evaluating Groundwater Quality Impacts of Shale Gas Extraction within the Marcellus Shale Play
PI: James Saiers; Co-PI: Karen Olson (Southwestern Energy)
Sponsor: National Science Foundation $151,182
Summary: The question that guides this study is "Does shale gas extraction lead to contamination of freshwater aquifers by methane, deep-formation brines, or frac-water chemicals?" To address this question, a suite of measurements will be made in freshwater aquifers that underlie portions of Susquehanna County, PA, a "sweet spot" of the Marcellus Shale Play. Analysis of these measurements will allow us to: (i) elucidate the spatial and temporal variations in methane concentrations and isotopic composition that occur naturally, prior to commencement of gas extraction activities; (ii) quantify perturbations in groundwater flow that are attributable to any step in the process of shale gas development; and (iii) evaluate changes in the chemical composition of groundwater induced by hydraulic fracturing and other stages of shale gas extraction.
New Project Funding: Craig Brodersen
Optical and Physical Deterrent for preventing ACP vector attack on Citrus
Yale PI: Craig Brodersen
Sponsor: University of Florida (Prime: Citrus Research and Development Foundation) $15,000
Summary: The long-term goal of this project is to develop a foliar kaolin particle film technology targeting specific wavelengths that will alter the feeding and oviposition behavior of Asian citrus Psyllid (ACP).
New Project Funding: Eli Fenichel
US-UK Collab: Risks of Animal and Plant Infectious Diseases through Trade (RAPID Trade)
PI: Eli Fenichel
Sponsor: Arizona State University (Prime: National Science Foundation) $140,990
Summary: World trade is a boon to economic development but it also increases the risk of dispersing human, animal, and plant diseases. Disease impacts on crop yields and livestock put global food supplies at risk and newly emergent diseases that move from animals to humans can threaten human health. But because trade is also one of the main drivers of economic development, it is important that it not be disrupted unnecessarily by measures to protect against disease risk. Striking the right balance is currently difficult to achieve, however, because trade impacts are not systematically incorporated into national and international disease risk assessments. This award supports an interdisciplinary and international team who seek to solve that problem by developing new tools for evaluating the disease risks of world trade. The risk assessment tools produced by the project will provide animal, plant, and human health authorities at national and international levels with the capacity to make improved assessment of the disease risks associated with imports, and of the consequences of alternative trade responses. Improving disease risk management will enhance national security and economic well-being by reducing both disease dispersal and the losses caused by trade interdictions. The project also will strengthen collaborations between US and UK scientists and train graduate students and post-doctoral scientists in research.
New Project Funding: Anthony Leiserowitz
TV Weathercasters and Climate Education: Expanding the Reach of Climate Matters
PI: Anthony Leiserowitz
Sponsor: George Mason University (Prime: National Science Foundation) $282,533
Summary: The Yale Project on Climate Change Communication (YPCCC) will oversee the design and implementation of two Climate Science Workshops per year, as well as ongoing professional development, for TV Weathercasters. One workshop will be held at each of the national annual meetings of the American Meteorological Society and the National Weather Association (2014-2015; 2015-2016; 2016-2017).
New Project Funding: Nadine Unger
Linking multi-scale measurements and models to advance understanding of BVOC-chemistry-climate feedbacks
PI: Nadine Unger
Sponsor: National Aeronautics and Space Administration $456,705
Summary: Terrestrial ecosystem emissions of biogenic volatile organic compounds (BVOCs) are a critical quantity in air pollution-climate interactions. This project exploits synergies between the NASA SEAC4RS, NSF NOMADSS and NOAA SENEX field campaigns during 2013 to constrain the BVOC emission impacts on atmospheric chemical composition in the U.S. through the growing season into the fall. The specific goals of this proposal are to: (1) improve realism of BVOC emission schemes for next generation global Earth system models (2) assess the impacts of BVOC emissions on oxidant and secondary aerosol formation and composition over the U.S. (3) quantify future global change impacts on BVOC emissions and projections of ozone, organic aerosol and methane for a broad range of possible scenarios (2010-2100). To achieve these goals, we will probe multiple atmospheric measurements from flux towers, aircraft campaigns and satellites in combination with a vegetation model run at the site-level, regional and global scales. The model incorporates two state-of-the-science conceptually different BVOC emission algorithms (photosynthesis-based and MEGAN v3.0) that are embedded within the same host simulation framework. A global carbon-chemistry-climate model based on NASA GISS Model- E2 with interactive terrestrial ecosystems (Yale-E2) will be employed to interpret the aircraft measurements and perform the future projections. The project will provide new quantitative insights into BVOC emissions and BVOC-chemistry-climate feedbacks in the contemporary and future worlds.
New Project Funding: Anobha Gurung (Advisor: Michelle Bell)
Susceptibility to exposure from traffic related air pollution and human health burden in Kathmandu Valley, Nepal
PI: Anobha Gurung, PhD Student
Sponsor: Environmental Protection Agency STAR Fellowship
Summary: Research is critically needed to quantify exposure to air pollution and human health burden in growing Asian cities. As part of her EPA STAR Fellowship, Anobha will investigate exposure to traffic related air pollution and human health burden with characterization of susceptibility factors (e.g. age) in urban areas of Kathmandu Valley, Nepal, one of the fastest urbanizing nations in South Asia. A review of studies conducted in Nepal of air pollution and human health, indicated a dearth of research with the few existing studies suggesting potentially serious health consequences. Here annual average urban population has grown 3.92% in the past ten years. Her previous research identified high air pollution in this region, a result of old vehicles, fuel adulteration, poor road infrastructure, unplanned urbanization, bowl like topography, and growing population. However, despite the rising urban population and traffic identified as the main source of pollution no study of traffic related air pollution and human health has been conducted in Kathmandu Valley.
New Project Funding: Jennifer Marlon
Collaborative Research: Testing hypotheses about human and climate impacts on fire over the past millennium using paleodata syntheses and global fire modeling
Yale PI: Jennifer Marlon, in collaboration with PI Brian Magi (UNC-Charlotte) and PI Patrick Bartlein (University of Oregon)
Sponsor: National Science Foundation $114,291
Summary: Fire is a fundamental process in the Earth system. In recent centuries, human use and suppression of fire and both natural and anthropogenic climate change have altered the types and spatio-temporal patterns of fires globally. In the future, as global temperatures continue to increase, fire activity is projected to increase in much of the world. While the fire projections are vital for managing physical and human systems, they are highly uncertain. To reduce the uncertainty, a better understanding of how fires interact with humans, climate, and vegetation is required - not only under current conditions, which have been extensively studied - but also in the past, when conditions were very different from today.
The proposed work will address three timely research objectives designed to use observed patterns of fire activity in the past to inform global fire modeling of the past, present and future. The project’s data and tools include a unique global charcoal database containing detailed records of biomass burning over the past 1000 years, multiple sources of paleoclimate data and simulations from the Palaeoclimate Modelling Intercomparison Project (PMIP3), two different global land-cover reconstructions, and a global fire model. To achieve the objectives, an established paleofire database (the Global Charcoal Database) will be expanded to include over 50% more records, and an existing global fire model based on present-day conditions will be adapted for simulations of the past millennium by testing individual fire model dependencies against observations of climate and fire over the past millennium.
New Project Funding: Eli Fenichel
Coastal SEES Collaborative Research: Adaptations of fish and fishing communities to rapid climate velocities
Yale PI: Eli Fenichel, in collaboration with PI Malin Pinsky (Rutgers) and PI Simon Levin (Princeton)
Sponsor: National Science Foundation $150,514
Summary: Climate change presents a profound challenge to the sustainability of coastal systems, but most research has ignored the important coupling between human responses to climate effects and the cumulative impacts of these responses on ecosystems. Fisheries are a prime example of this feedback: climate drives shifts in species distributions and abundances, and fisheries adapt to these shifts. However, changes in the location and intensity of fishing also have major ecosystem impacts. This project’s goal is to understand how climate and fishing interact to affect the long-term sustainability of marine populations and the ecosystem services they support. The project focuses on fisheries for summer flounder and hake on the northeast U.S. continental shelf, which target some of the most rapidly shifting species in North America. The project addresses three questions: 1) How do the interacting impacts of fishing and climate velocities affect the persistence, abundance, and distribution of marine fishes? 2) How do fishers and fishing communities adapt to species range shifts and related changes in abundance? and 3) Which institutions create incentives that sustain or maximize the value of natural capital and comprehensive social wealth in the face of rapid climate velocities?
New Project Funding: Alex Felson, James Axley, & Graeme Berlyn
The transformation of existing green wall technology to provide urban heat rejection infrastructure
PI: Alex Felson
Co-PIs: James Axley, and Graeme Berlyn
Sponsor: National Science Foundation $299,960
Summary: Green walls provide benefits that have fostered the growth of a new industry as they can passively moderate exterior wall surface temperatures and thereby reduce building heating and cooling loads, attenuate surface temperature variations and solar exposure that degrade exterior wall finishes, and provide ecosystem service benefits including air pollution and particulate removal, mitigation of urban heat island effects, and urban wildlife habitats. To date, these benefits do not offset the costs of green walls, and therefore, the market for green walls remains limited. This research will address problems that must be resolved to transform existing green wall technology into an active technology for process heat rejection (i.e., principally, here, for chilled water generation), and thereby expand the market to a wide range of applications from households to institutions and industry. The objective is to provide a sustainable alternative to wet cooling tower technology that maintains the benefits of existing green walls, employing their methods of construction and operation, while avoiding the shortcomings of wet cooling tower technologies (i.e., single use and contamination of cooling water).
New Project Funding: Ben Cashore
Small Scale Funding Agreement Relating to Regional Delivery of the REDD+ Academy
PI: Ben Cashore
Sponsor: United Nations Environment Programme (UNEP) $199,942
Summary: The overall objective of the project is to ensure the development and delivery of a strong process for capacity building in which the needs of participants are tied to the delivery of on-the-ground REDD+ readiness activities through a long-term and sustainable learning experience. The partnership is intended to produce pre-course material and complete learning modules as well as quality control for the 'REDD+ Academy'. The materials and framework required for launching a massive open online course (MOOC) on REDD+ and Land-use Planning will also be developed.
Karen Seto Succeeds David Skelly as Associate Dean & Doctoral Studies Director
Karen Seto, a professor of geography and urbanization at the Yale School of Forestry & Environmental Studies (F&ES), has been named the School’s next Associate Dean for Research and Director of Doctoral Studies.
For Seto, who has been at Yale for six years, the new position offers a chance to reassess how the School prepares its students for a changing academic world — and to continue the work started by Skelly to integrate the realms of research and doctoral studies at F&ES.
New Project Funding: Kris Covey (Advisor: Mark Bradford)
Dissertation Research: Quantification and Characterization of the Production of Methane in Living Trees
PI: Mark Bradford (Faculty Advisor), Doctoral Candidate: Kris Covey
Sponsor: National Science Foundation (Doctoral Dissertation Improvement Grant) $21,645
Summary: Dissertation research undertaken thus far demonstrates the prevalence of elevated methane concentrations in upland hardwood dominated eastern forests, illuminates distinct species level patterns in production potential, and suggests that the highest methane production rates drive substantial through bark emission. Initial estimates indicate the magnitude of this unrecognized source could be on the same order as the upland forest methane sink.The PIs propose expanding their current work to achieve three primary objectives: 1. Determine the extent to which methane production observed in the trunks of eastern hardwood trees also occurs in conifer-dominated western forests. 2. Assess the contribution of methane production in dead wood and debris to overall forest methane flux. 3. Associate measured methane production with microbial community dynamics in wood.This work is transformative because it asks whether methane production from understudied methane sources changes forests from net methane sinks to sources. We know that heart rot is ubiquitous in forests but its part in global CH4 budgets has not been considered until publication of our preliminary data. Initial estimates from our paper suggest that heart-rot methane emissions are equivalent in global warming potential to about 18% of the carbon dioxide likely sequestered by the stand in which we worked. The studies proposed here will allow for the expansion of our current work by providing the data necessary build our initial CH4 rate estimates beyond the individual forest stand to a robust estimate of continental emissions of methane originating in living trees. Furthermore, these data will help to disentangle the contribution of in situ microbial-born methane from the other confirmed plant-methane pathways.
New Project Funding: Thomas Graedel
Anthropogenic Life Cycles of Scarce Metals
PI: Thomas Graedel
Sponsor: U.S. Geological Survey $48,469
Summary: Material flow analysis approaches have been used widely over the past decade to characterize the life cycles of the major metals. A similar situation has not occurred for the scarce metals, many of which are uniquely useful constituents of new technological development. This is partly due to the fact that information regarding those cycles is less readily available. However, as part of a larger criticality of metals project, we have developed information on the extraction, use, discard, and loss of a number of the scarce metals. We will use this information to construct global and U.S. life cycles for year 2008 for four scarce metals: gallium, indium, germanium, and rhenium; these are the first U.S. cycles ever to be characterized in detail for these metals. The results of this study will help to build further knowledge on the less common (“scarcer”) metals, many of which have been identified by the USGS Minerals Research Program to be of increasing importance to the U.S. national economy. Understanding the whole system of material flows can help to quantify potential primary and secondary source strengths, manage metal use more wisely, and protect the environment.
New Project Funding: Shimon Anisfeld
The Future of Long Island Sound Tidal Marshes: Understanding Marsh Migration into Different Upland Types
PI: Shimon Anisfeld; Co-PI: Andrew Kemp (Tufts University)
Sponsor: Connecticut Sea Grant $129,994
Summary: Shimon Anisfeld and his colleague Andrew Kemp will investigate the ability of salt marshes to migrate upland as sea levels rise. Healthy marshes protect shorelines from storm impacts and serve as nursery habitat for many animals. Their successful migration will depend on many factors such as elevation, hydrology, soils, plants, and animals.
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Kuebbing, S.E. and M.A. Nunez.“Negative, neutral, and positive interactions among nonnative plants: patterns, processes, and management implications.”Global Change Biology21.2(2015): 926-934. DOI: 10.1111/gcb.12711
Zhu, J. and M. Ruth.“Relocation or reallocation: Impacts of differentiated energy saving regulation on manufacturing industries in China.”Ecological Economics110(2015): 119-133. DOI: 10.1016/j.ecolecon.2014.12.020
Eshel, G., A. Shepon, T. Makov, and R. Milo.“Reply to Tichenor: Proposed update to beef greenhouse gas footprint is numerically questionable and well within current uncertainty bounds.”Proceedings of the National Academy of Sciences of the United States of America112.8(2015): E822-E823. DOI: 10.1073/pnas.1422670112
Choat, B., C.R. Brodersen, and A.J. McElrone.“Synchrotron X-ray microtomography of xylem embolism in Sequoia sempervirens saplings during cycles of drought and recovery.”New Phytologist205.3(2015): 1095-1105. DOI: 10.1111/nph.13110
Liu, J., H. Mooney, V. Hull, S.J. Davis, J. Gaskell, T. Hertel, J. Lubchenco, K.C. Seto, P. Gleick, C. Kremen, and S. Li.“Systems integration for global sustainability.”Science347.6225(2015): 963+. DOI: 10.1126/science.1258832
Harper, E.M., Z. Diao, S. Panousi, P. Nuss, M.J. Eckelman, and T.E. Graedel.“The criticality of four nuclear energy metals.”Resources Conservation and Recycling95(2015): 193-201. DOI: 10.1016/j.resconrec.2014.12.009
Wood, S.A. and R.O. Mendelsohn.“The impact of climate change on agricultural net revenue: a case study in the Fouta Djallon, West Africa.”Environment and Development Economics20.1(2015): 20-36. DOI: 10.1017/S1355770X14000084