Dave Matthews Band: offsets CO2 emissions produced by their multi-city tours by funding projects such as tree plantings and wind turbine construction.

Cate Blanchett: plans to equip Sydney Theatre Company building with solar panels, rainwater collection systems to make it completely eco-friendly. Sydney home is fully powered by solar energy, donates to Forest Guardians.

Richard Branson: Virgin Group chairman, a former global warming skeptic, who in Sept. 2006 pledged to spend all profits from his airline and rail businesses (estimated $3 billion over 10 years) on investments in biofuel research and projects to tackle emissions.

Pierce Brosnan: focuses on marine mammal and wetland protection, headlined Natural Resources Defense Council campaign against effects of Navy sonar on whales, awarded 1997 Green Cross International Environmental Leadership Award.

Ward Burton: Ward Burton - Ward Burton Wildlife Foundation: NASCAR driver and winner of the Daytona 500, he is the founder of this foundation whose mission is to conserve America’s land and wildlife.

Gwyneth Paltrow & Camerson Diaz: Act Green: "unite to conserve energy and reduce our reliance on oil."

Cameron Diaz: Trippin', MTV Series: "Cameron Diaz and a group of her close, personal friends think globally and act globally too as they travel to unlikely getaways...from Chile to Yellowstone, on a quest to safeguard the environment."

Leonardo Dicaprio: started the Leonardo DiCaprio Foundation in 1998 to promote environmental issues, drives a hybrid car, currently writing and producing a feature length documentary on global warming called "11th Hour".

Harrison Ford: vice chairman of Conservation International, has a Central American ant named after him, won the Global Environmental Citizen Award in 2002.

Jane Goodall: The Jane Goodall Institute: Purpose to advance the power of individuals to take informed and compassionate action to improve the environment of all living things

Daryl Hannah: arrested in June 2006 for staging a 23-day tree sit-in during a bid to preserve an urban community garden in Los Angeles, traveled across America in 2005 in a biofuel car, home is entirely off-grid. dh love life: a video blog focused on green topics

Woody Harrelson: "transforming the world together." This is a guy that is inspiring, focuses on biodiesel, getting off the grid, organic & overall good green-ness.

Josh Hartnett, Orlando Bloom, Maroon 5, Kt Tunstall: promoting 2007 Global Cool initiative to cut carbon emissions by encouraging people to turn off TVs, mobile-phone chargers and other energy-draining gadgets.

Barenaked Ladies: run their tour buses and trucks on biodiesel fuel.

Alanis Morissette: given 2003 Environmental Media Association Missions in Music Award; campaigns against oil drilling in Alaska; has solar panels on home.

Willie Nelson: singer, co-partner in the Willie Nelson Biodiesel Company.

Edward Norton: launched the BP Solar Neighbors Program in 2003 which matches each celebrity purchase of a solar energy home system with a solar installation in a low-income family home in Los Angeles.

Brad Pitt: co-creator of design competition to build 20 affordable, reduced energy, environmentally friendly homes in New Orleans.

Robert Redford: 30 years on board of Natural Resources Defense Council, founder of Sundance Preserve, winner of 1993 Earth Day award, 1987 United Nations Global 500 award. In April 2007, launches weekly three-hour slot called "The Green", dedicated entirely to the environment, on his Sundance TV channel.

Sting: founder in 1989 of Rainforest Foundation to protect rain forests and their indigenous peoples.

Kt Tunstall: ran her US tour bus on biodiesel fuel, performed at eco-friendly "Golden Green" at the 2007 Golden Globe awards in Los Angeles.

Neil Young: 2004 North American tour fueled entirely with biodiesel.