Spring 2012
"Journey into Climate"
Dr. Paul Mayewski, Director of the Climate Change Institute

Fall 2011
"The Future of Conservation"
Dr. Eric Dinerstein, Chief Scientist, World Wildlife Fund

Spring 2011
“The New Work of Environmentalism: Preparing Colby Students to Lead”
Peter Forbes, Co-Director, Center for Whole Communities

Fall 2010
"Take a position: The need for steady statesmanship from the academic grassroots"
Brian Czech, President, Center for the Advancement of the Steady State Economy

Spring 2010
"Rediscovering the Village Green: The Power of the Community Parks Movement"
Steve Coleman, Executive Director, Washington Parks and People

Fall 2009
“Cool Cities: Solving Global Warming One City at a Time”
Glen Brand, Director, Sierra Club's National Cool Cities Campaign

Spring 2009
“The Business Implications of Climate Change”
Andrew Hoffman, Holcim (US) Professor of Sustainable Enterprise, University of Michigan

Fall 2008
“Boots on the Ground: Lessons from Renewable Energy Development in SE Asia, from Concept to Contract”
Gijsbert Nollen, Principal Consultant, ICE BV

Spring 2008
"Fanning the Flames: Some Next Steps for the World Climate Movement" 
Jon Isham, Luce Professor of International Environmental Economics, Middlebury College

Fall 2007
"Citizen Stewards: Reclaiming the Authority, Privilege, and Duty of Stewardship"
John Terry, Executive Director, Gulf of Maine Institute

Spring 2007
"The Northeast Regional Greenhouse Gas Initiative (RGGI): A precedent setting and priority policy for Maine and for the Nature Conservancy"
Sarah Murdock ‘84, Senior Policy Advisor, The Nature Conservancy

Fall 2006
“Inspiring Progress: Religions' Contributions to Sustainable Development” 
Gary Gardner, Director of Research, Worldwatch Institute

Spring 2006
"Examining the Impact of Pesticides on Environmental and Public Health"
Dr. Tyrone Hayes, Professor of Biology, University of California, Berkeley

Fall 2005
"A Field Biologist's Odyssey: A Lifetime of Discovery"
Dr. Ron Tilson, Director of Conservation, Minnesota Zoo

Spring 2005
"Offshore Energy -- Promise or Peril?"
Vivian Newman, Conservation Chair of the Sierra Club's Maine Chapter

Fall 2004
"Reading the Forested Landscape" 
Professor Tom Wessels, Professor of Environmental Studies, Antioch New England

Spring 2004
"The Emerging Alliance of Religion and Ecology"
Professor John Grim, Professor of Religion, Bucknell University

Fall 2003
"Market-Based Approaches to Environmental Protection: Faustian Bargain or Paradise Regained?"
Professor Tom Tietenberg, Colby College Mitchell Family Professor of Economics