Roger Ballentine. A senior member of the White House staff for President Clinton, he was Chairman of the Climate Change Task Force and Deputy Assistant to the President for Environmental Initiatives. He directed the Administration's efforts on climate change and represented the President in numerous international meetings and negotiations… More >>

Joe Romm. Author, physicist and renowned global warming blogger, he is described by U.S. News & World Report as “one of the most influential energy and environmental policy makers in the Obama era.” Time magazine credits him with “the most cogent, memorable, and deployable arguments for immediate overwhelming action (on) global warming”… More >>

Lester Brown. Founder of Earth Policy Institute and Worldwatch Institute, he is expert on climate change, food supply and agriculture. He is the author of Outgrowing the Earth: The Food Security Challenge in an Age of Falling Water Tables and Rising Temperatures. He helped pioneer the idea of environmentally sustainable development… More >>

Christine Ervin. Appointed by President Clinton to serve as Assistant Secretary of Energy, her office led development of most of the President’s 50 Climate Change Action Plan initiatives and the influential "Five Labs Study" documenting the potential of low-carbon technologies. She is an advisor to The Climate Trust… More >>

Denis Hayes. Organizer of the first Earth Day in 1970, former Stanford professor and Director of the federal National Renewable Energy Laboratory. He is a Fellow of the American Solar Energy Society and co-chairs Seattle Mayor Greg Nickels' Green Ribbon Commission on Climate Protection, exploring non-nuclear climate solutions… More >>

Dan Grossman. A journalist and media producer focused on the science and impacts of global warming, he has received many of the most prestigious awards in science journalism. He shares a Peabody Award, the highest honor in broadcast journalism, and he has written for The New York Times, Rolling Stone, and Scientific American… More >>

Michel Gelobter. He is the founder and chairman of Cooler, Inc., a for-profit social venture and buying network helping businesses and consumers reduce or offset their carbon emissions. He is a past president of Redefining Progress, and under his leadership it took part in the design of the world’s most aggressive climate legislation… More >>

Roberta Bondar. Astronaut and nature photographer, she is featured – camera in hand floating during spaceflight – in the IMAX movie Destiny In Space. Bondar flew on the shuttle Discovery, and has worked to understand shifting ecosystems and the effects of global warming, especially with regard to disease transmission and human health… More >>

George Divoky. A scientist whose observations of seabirds provides one of the best examples of the reality of global warming in the arctic, his presentations focus on understanding climate change and its impacts. Denis Hayes describes his presentation as "hilarious, poignant, provocative, compelling. He held the crowd rapt…" More >>

Eban Goodstein. Executive Director of the Green House Network, a non-profit organization doing public education on global warming. It sponsors "The Race to Stop Global Warming," a run/walk now in cities nationwide, including New York, Chicago and San Francisco. He has given more than 100 presentations on global warming around the country… More >>

Raymond Bradley. Director of the Climate System Research Center at the University of Massachusetts, he has written or edited eleven books on climatic change and paleoclimatology. He has been an advisor on climate issues to the National Oceanic and Atmospheric Administration and the Inter-Governmental Panel on Climate Change… More >>

Francesca Lyman. Author of The Greenhouse Trap: What We're Doing to the Atmosphere and How We Can Slow Global Warming, she is an award-winning journalist, author and editor. For the last five years she has written the "Your Environment" column for MSNBC.com, and she has served as editor of The Amicus Journal and Not Man Apart… More >>

Bob Doppelt. Director of The Climate Leadership Initiative, part of the Institute for a Sustainable Environment at the University of Oregon, he authored Leading Change Toward Sustainability: A Change-Management Guide for Business, Government and Civil Society. It was deemed to be one of the nine most important books on sustainability… More >>

Jim Motavalli. Editor of E Magazine, a national environmental bi-monthly, as well as editor of the book Feeling the Heat: Dispatches from the Frontlines of Climate Change. He has written for The New York Times, The Boston Globe, Salon, Grist, and many others. An engaging speaker, he can enlighten audiences about climate change… More >>

Linda Mason Hunter. A nationally recognized expert on healthy homes and green lifestyles, she has researched and written eleven books as well as hundreds of articles and tips for green living. She applies this extensive body of green home and lifestyle information to offer a presentation on how you can reduce your carbon footprint… More >>

Peter Melhus. Chair of the Board of the Silicon Valley Environmental Partnership, he completed a 25-year career with Pacific Gas & Electric Company in 1998, the last eight directing environmental policy for the company. He speaks about energy policy, the energy portfolio of the future, and saving money by reducing greenhouse gases… More >>

Jack Robinson. Founder of Winslow Management Company, his views have been featured in The Wall Street Journal and The New York Times. He speaks on climate change as a driver of investment risk and opportunity, and explains how companies contributing most to global warming incur risks while climate friendly companies gain advantage… More >>

Wil Burns. He specializes in the scientific, legal and political issues related to climate change and biodiversity. He has edited two books, and his articles have appeared in The San Francisco Chronicle, The San Jose Mercury News, and The Milwaukee Sentinel. He speaks on the impacts of global warming and what we can do about it… More >>