Alternative fuel sources for automobiles, trains and airplanes include cooking grease, plant stalks, algae, hydrogen and sunshine.
EP2 Zero WasteAug 21, 2007
Renewable energy sources, including wind, geothermal and water, are examined.
EP3 Building GreenAug 22, 2007
Following researchers as they attempt to predict the future of Earth's weather. Also: engineers and technicians who have ingenious ways to counter meteorological disasters.
EP4 Powering UpAug 23, 2007
Eco-conscious construction techniques by environmentally aware builders, scientists, architects and designers
