Dr. Clark is a Research Scientist for the US EPA's Office of Research and Development, Global Change Research Group (http://www.epa.gov/ncea/global/). He works on a range of issues related to climate change, urban resilience, biodiversity, and biofuels. Major activities are summarized below by theme:Climate Change • Leader of the United States Global Change Research Program (USGCRP) Cluster on Biogeochemical Cycles (co-lead NOAA). (http://www.globalchange.gov/) • Task Leader of EPA project on modeling impacts from climate change and air pollution on terrestrial biodiversity for the EPA’s Air-Climate-Energy National Program. (http://www.epa.gov/aboutepa/ord/ace.html)• Lead author 2013 USGCRP National Climate Assessment Chapter on Biogeochemical Cycles. (http://www.globalchange.gov/what-we-do/assessment)Urban Resilience• EPA Project Leader for Interagency Agreement with National Science Foundation on Urban Vulnerability to Climate Change.• Contributing author to the 2013 National Climate Assessment Chapter on Urban Systems. (http://www.globalchange.gov/what-we-do/assessment).Biodiversity and Air Pollution• Lead Contributor, U.S. contribution to UN Convention on Long-range Transboundary Air Pollution Call for Data on biodiversity impacts (http://www.unece.org/env/lrtap/)• Task Leader of EPA project on impacts from Nitrogen deposition on plant biodiversity nationally for the EPA’s Safe and Health Communities National Program. (http://www.epa.gov/aboutepa/ord/shc.html). Biofuels• EPA representative on the Operations Committee and Analysis Working Group for the Biomass Research and Development Board. (http://www.biomassboard.gov/)• Lead and Contributing Researcher for several research projects on economic feasibility and environmental impacts from biofuels.• Coordinating Author for the First Triennial Report to Congress (RtC) on Biofuels, Chapter on Perennial Grasses. (http://cfpub.epa.gov/ncea/biofuels/recordisplay.cfm?deid=235881)

As a AAAS Science and Technology POlicy Fellow, we broadly are involved with the development of enhancing the connections between policy decisions and current science. My Fellowship was in the EPA's Office of Research and Development, Global Change Research Program, where I worked on science and policy issues related to climate change, urban resilience and development, biofuels, and a host of other issues. Several of my projects directly informed Congress, EPA, and the White House on variuous issues of scientific concern.

Here is a list of some publications I've (co)authored:US EPA. Biofuels and the Environment: First Triennial Report to Congress (http://cfpub.epa.gov/ncea/cfm/recordisplay.cfm?deid=217443).Ridley, Caroline, et.al. Biofuels: Network analysis of the literature reveals key environmental and economic unknowns (accepted, Environmental Science & Technology)Clark, C. M., D. Tilman. Loss of plant species after chronic low-level nitrogen deposition to prairie grasslands. 2008. Nature 451: 712-715. Pardo, L.H., et.al. Effects of N deposition on terrestrial and aquatic ecosystems in the United States: a synthesis. (in press, Ecological Applications; and as a General Techincal Report for the USFS, NRS-80; I authored Chapter 11: Great Plains).Clark, C. M., et.al. Strengthening the link between functional diversity and ecosystem function: novel extensions of existing metrics highlight the importance of abundance. (in review, Ecology).Clark, C. M. and D. Tilman. Recovery of plant diversity following N cessation: effects of recruitment, litter, and elevated N cycling. 2010. Ecology 91: 3620-3630.Bai, Y., et.al. Tradeoffs and thresholds in the effects of nitrogen addition on biodiversity and ecosystem functioning: evidence from Inner Mongolia grasslands. 2010. Global Change Biology 16: 358-372.Clark, C. M., et.al. 2009. Long-lasting effects on N cycling 12 years after treatments cease despite minimal long-term N retention. Global Change Biology 15:1755-1766.Clark, C. M., et.al. 2007. Biodiversity loss following N enrichment depends on environmental context. Ecology Letters 10: 596-607.Fargione, J., et.al. 2007. From selection to complementarity: shifts in the causes of biodiversity-productivity relationships in a long term biodiversity experiment. Proceedings of the Royal Society B 274:871-876.Suding, Katherine N., et.al. 2005. Functional- and abundance-based mechanisms explain diversity loss due to N fertilization. PNAS 102:4387-4392.