Justin Carven 98F: founder of Greasecar Vegetable Fuel Systems, which convert diesel engines to run on vegetable oil; the conversion system is based on his Division III work at Hampshire

Story Clark 71F: land conservationist, author of A Field Guide to Conservation Finance

Kert Davies 80F: research director for Greenpeace U.S., directed Greenpeace’s global warming and energy campaign until 2002 when he formed the research unit

Peter C. Evans 83F: director, Global Strategy and Planning at GE Energy Infrastructure, which produces gas turbines, wind turbines, and an array of other energy systems designed to meet the needs of a carbo-constrained world

Joseph Fargione 92F: science director for Central U.S. Region of The Nature Conservancy, working on conservation strategies around regional issues, such as biofuels, wind energy, prairie restoration, and carbon sequestration

Nancy Grimm 73F: ecology professor and researcher at Arizona State University’s Center for Environmental Studies, co-director of the Central Arizona-Phoenix Long-Term Ecological Research Project, past president of the Ecological Society of America

Gary Hirshberg 72F: CE-Yo of Stonyfield Farm, the world’s leading organic yogurt producer, author of Stirring It Up: How to Make Money and Save the World

Jeffrey Hollender 74S: cofounder of Seventh Generation, the country's largest distributor of nontoxic, all-natural cleaning, paper and personal care products

Richard Huber 72F: principal environmental specialist, Department of Sustainable Development (DSD) of the Organization of American States

Eric Loring 80F: environment and health researcher, Inuit Tapiriit Kanatami, Ottawa, Canada, working to address the effects of environmental contaminants and climate change on the Inuit

Michael Sands 70F: executive director, Liberty Prairie Foundation; environmental team leader, Prairie Crossing, a sustainable farm-based suburban conservation community

David Schimel 73F: ecologist who works on the greenhouse effect

Amy Seidl 83F: teaches in environmental programs at the University of Vermont and Middlebury College; author of Early Spring, a book that uses her own back yard as a jumping-off point for a discussion of global climate issues

Eric Steig 84F: professor, earth and space sciences, University of Washington; director of Quaternary Research Center

Tom Stoner 78F: CEO, Sand Investment Holdings LLC

Whitney Tilt 77S: director of resources for community collaboration, Sonoran Institute, a nonprofit environmental stewardship organization seeking to educate and enable community decisions and policies