1. Composting Toilets

... suspicions when they replaced the chamber pot. Some health departments do not approve composting toilets as an alternative to septic fields. A septic field may still be required for treatment of grey water ...

2. Solar Vehicles

... vehicle using helium gas for lift, and thin-film solar cells for power. The United States Department of Defense Missile Defense Agency has contracted Lockheed Martin to construct it to enhance the Ballistic ...

3. Energy Efficiency for Industry

... can reduce this energy usage 20 percent (according to the US Department of Energy) by insulating steam and condensate return lines, stopping steam leakage, and maintaining steam traps. Electric motors ...

4. Energy recycling

... heat recovery projects have higher efficiencies. A 2007 Department of Energy study found the potential for 135,000 megawatts of CHP in the U.S., and a Lawrence Berkley National Laboratory study identified ...