Raising food in the city: Will Allen, founder, Growing Power Community Food Center, Milwaukee, Wisconsin

Discovering a new way to clean polluted water: Kelydra Welcker, student chemist, environmental scientist, and inventor, Parkersburg, West Virginia

Turning waste into good business and good jobs: Omar Freilla, founder, ReBuilders Souce, The South Bronx, New York City

Bringing solar power to Indian country: Debby Tewa, solar electrician, Hopi Indian Reservation, Arizona

Speaking out to a bigoil company: Margie Richard, activist and former middle school teacher, Old Diamond, Louisiana

Inventing eco-machines: John Todd, inventor, engineer, and designer, Woods Hole, Massachusetts

Recycling electronic waste: Alex Lin, teenager who helped write Rhode Island's e-waste law, Westerly, Rhode Island

Saving West Virginia's oldest mountains: Julia "Judy" Bonds, community activist, Coal River Mountain Watch, Whitesville, West Virginia

Fighting the enemies of the environment: El Hijo del Santo ("Son of the Saint"), champion masked wrestler, Mexico City, Mexico

Protecting Louisiana wetlands: Barry Guillot, middle school science teacher, Destrehan, Louisiana

Saving the Porcupine River caribou: Sarah James, spokesperson, Gwich'in Indian people of Alaska and Canada, Arctic Village, Alaska

Safeguarding the California coast: Erica Fernandez, student and environmental activist, Oxnard, California

How you can get involved.