Homemade biodigesters turn human and food waste into biogas, which can be used to heat water, cook food, or produce electricity.
Kidnapped from India to Canada, she was beaten, starved, and caged until a kind foster mother saved her. Now she's a UN special adviser on human rights.
Three young activists have found creative ways to tackle issues from climate change to voting rights.
From founding free universities to advocating for small farmers to training rats to detect land mines Africa's future entrepreneurs will boost the continent.
In Firebaugh, Calif., a small school district has become a model for the nation by switching to solar power and investing the money it saves in arts programs.
The Citizens Committee for New York City has become one of America’s oldest and most successful micro-funding organizations, backing citizen-led projects from urban gardens to recycling efforts.
Her Sunrise Children's Village in Cambodia helps children who are 'abused, discarded, neglected, unloved, unwanted' to grow up to be whatever they want to be.
His Inner City Advisors in the Bay Area shows that social businesses can create good jobs, even in the heart of a recession.
In much of the developing world people must carry water on their backs for use in their homes. PackH2O makes the job easier while keeping the water clean.
He's barreled headfirst into his task, visiting more than 100 countries; met world leaders and African warlords; had an Uzi pointed at his chest – and challenged the status quo.
She collects leftover crops from farmers' fields and delivers the fresh produce to food pantries and homeless shelters across North Carolina.
Bees play a crucial role in agriculture, helping to produce more than 30 percent of the world’s food supply. These organizations work to protect bees and keep them on the job.
The Peace Crane Project is an invitation to kids everywhere to write a poem or message – or draw or paint a picture – of peace. Then they fold it into an origami crane and fly it to the world.
Northeast Kansas needed a safe, inexpensive, way for its citizens to get around. A ride-sharing experiment shows a 21st-century version of hitchhiking may be an answer.
She launched Afghanistan Samsortya, a nonprofit designed to reverse decades of deforestation by planting fruit trees and teaching forestry skills.
The center has become a place where mothers and children, many of whom still live in temporary homes, can reconnect, share their experiences, and support one another.
David Gerson left his lucrative law practice to head Loaves and Fishes of Contra Costa, a nonprofit effort that provides free meals and other service to those in need.
Her Yoga Reaches Out charity has held Yogathons on both coasts and collected more than $1 million to help children and their families.
Conservation groups are mounting public service campaigns to persuade Vietnamese that buying rhino horn is decidedly uncool.
The physicist heads a new $5 million Georgetown Energy Prize that encourages midsize cities to develop innovative ways to slash energy use.