"Some 10 million species of plants, animals, and microbes are thought to inhabit the earth, but so far only about 1.5 million of these have been identified. A mere 15 of the approximately 250,000 known plant species provide the world's human population with about 90 percent of its food.1 These...

Renewable and solar energy technologies : energy and environmental issues / David Pimentel -- Can the Earth deliver the biomass-for-fuel we demand? / Tad W. Patzek -- A review of the economic rewards and risks of ethanol production / David Swenson -- Subsidies to ethanol in the United States /...