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Bill Gates Funds Futuristic Toilets: No Piped Water, Sewer or Electricity Needed

Poop in, clean water out. Bill Gates has invested more than three million dollars on behalf of the 2.6 billion people around the world who don't have access to modern toilets. Yesterday, the three winners of his "next-generation toilet prize were announced, showcasing innovative designs that capture and process human waste without piped water, sewer or electrical connections. Even more impressive, the toilet prize-winners all transformed human waste into useful resources, such as energy and water.

13-Year-old Recycles Cooking Grease into Heating Oil for Needy Families

After reading an article in the local newspaper, Cassandra Lin discovered that many residents could not afford to heat their homes. Inspired to do something, she formed a team of seventh graders to recycle waste cooking oil and turn it into biofuel for distribution to needy families. They collected 36,000 gallons in one year.

New Hospital in Haiti is Fully Powered by 1,800 Solar Panels

Stretched across the rooftop of a new teaching hospital 30 miles north of Port-au-Prince, a vast array of 1,800 solar panels conquers the problem of an intermittent power grid. The University Hospital produces more than 100 percent of its required energy every day, an impressive feat for a building in the middle of Haiti.

How Energy Efficiency is "Lighting Up" the Streets of Philadelphia

Not just in homes and buildings, Philadelphia has revved up its energy efficiency campaign in the streets. Through the Greenworks Philadelphia project, the Philadelphia Streets Department is converting 58,000 yellow and green traffic signals to LED lights, replacing traditional energy-draining bulbs and saving the city $1 million of electricity costs every year.