2013 review of studies relevant to metro reporting and coverage of U.S. cities.
2008 University of Pennsylvania study of the relationship between curbside tree plantings and property-value changes.
2009 OSRAM Opto Semiconductors study, comparing the environmental performance of incandescents, compact fluorescents and LEDs
Study by researchers at Towson University and the Smithsonian Conservation Biology Institute on survival rates and causes of death of gray catbirds
2010 study from the Nature Conservancy Center for Science and Public Policy on patterns of stream-flow depletion across 18 Arizona watersheds and possible mitigation strategies.
2008 paper by Harvard University and others looking at the economic and policy drivers of national land-use change.
2010 study examining the challenges of coordinating small-scale and large-scale endangered-species lists.
2008 Yale and Harvard University paper on the relative merits of policies to encourage efficient use of scarce water resources.
Paper by the Widener University School of Law on approaches for realizing the potential benefits of energy efficiency.
2009 McKinsey & Company study on the potential benefits of reducing U.S. energy consumption