Kasia Kocecki releases a salmon fry into a stream during Earth Day celebrations at the Vancouver Aquarium in Vancouver, British Columbia on Tuesday, April 22, 2008.
Credit: AP Photo/The Canadian Press
A member of the city parks and grounds department plants a tree at Ivy Hill Elementary School in Newark, N.J., during an Earth Day ceremony Tuesday, April 22, 2008.
Credit: AP Photo/Mike Derer
Hungry onlookers wait as Mary Carhartt removes cookies baked in a solar oven at the Earth Day festivities at Civic Center Park in Denver, Colo. on Tuesday, April 22, 2008. The cookies bake in about 20 minutes using the sun's power.
Credit: AP Photo/Peter M. Fredin
President Bush, second from right, Canadian Prime Minister Stephen Harper, second from left, and Mexican President Felipe Calderon participate in a tree planting ceremony for Earth Day, Tuesday, April 22, 2008, at the North American Leaders Summit in New Orleans. New Orleans Mayor Ray Nagin is at left.
Credit: AP Photo/Gerald Herbert
Kids visiting the Florida Capitol for Earth Day, get an close-up look at a Florida alligator, Tuesday, April 22, 2008, in Tallahassee, Fla.
Credit: AP Photo/Phil Coale
Children paint pictures with soil to commemorate Earth Day in Panama City, Tuesday, April, 22, 2008.
Credit: AP Photo/Arnulfo Franco
A sole plant grows out of a dry lake bed in Carpineni, Moldova, Tuesday, April 22, 2008. Moldova, the poorest country in Europe, has suffered droughts in four of the past five years and low rainfall over the past three years have led to severely diminished harvest in Moldova, which relies on agriculture for 70 percent of its GDP.
Credit: AP Photo/John McConnico
On the eve of the internationally recognized "Earth Day," Taipei's city government writes "Cool Below 2 Degrees" on the side of the Taipei 101 building to address global warming in Taipei, Taiwan, Monday, April 21, 2008.
Credit: AP Photo/Wally Santana
Participants of the Critical Mass bicycle ride lift their bicycles above their heads following their ride across Budapest, Hungary, Sunday, April 20, 2008. Tens of thousands Hungarian cyclists participated the Critical Mass, a worldwide movement devoted to riding bicycles.
Credit: AP Photo/Bela Szandelszky
Litle Rock, Ark.
Asian elephant Ellen puts old computer parts into a recycle bin at the Zoo in Little Rock, Ark., Tuesday, April 15, 2008. Over the weekend, visitors were asked to bring old electronics to the zoo to be recycled free of charge.
Credit: AP Photo/Danny Johnston
Key West, Fla.
"Living Green in the Key" is spelled out in sand sculptures Saturday, April 19, 2008, during an Earth Day event in Islamorada, Fla. Participants paid $300 to form each letter that featured a Florida Keys flora or fauna icon. Proceeds benefit the Florida Keys Wild Bird Center, a local rehabilitation and treatment center for indigenous avian species.
Credit: AP Photo/Florida Keys News Bureau
Activists stage a protest wearing electric transformer costumes at the National Ecology Center as part of Earth Day activities in Manila, April 20, 2008. Environmental advocates staged the rally to symbolize the problem with the toxic stockpiles of PCB wastes and to recognize the effort to rid the country of these chemicals which are toxic to human health and the environment.
Credit: AP Photo/Aaron Favila
PETA activists clad partly with fresh lettuce, hold placards as they protest at a square in Manila, Philippines, Friday, April 18, 2008. The activists, protesting ahead of the global celebration of Earth Day, alleged in their statement that "meat production has a devastating impact on the environment" and urged people to go vegetarian instead.
Credit: AP Photo/Bullit Marquez
A visitor to an outdoor Earth Day exhibition walks past a mural made by Seattle-based photo artist and cultutal activist Chris Jordan at Taiwan's Democracy Hall square Taipei, Taiwan, Friday, April 18, 2008. The image shows a Van Gogh-based image made of 200,000 packs of cigarettes, marking the number of American who die from smoking-related death every six months.
Credit: AP Photo/Wally Santana