San Francisco Mayor Gavin Newsom hopes to ride the energy wave of the future by sinking turbines under the Golden Gate Bridge and current-catching generators in the ocean. The idea: Produce electricity for the city to sell or use, or both.

Socially conscious investing mutual funds, which factor environmental, social, and corporate governance consequences into their selections, have been attracting more interest, with assets growing from $12 billion in 1995 to $178.7 billion today.

With energy prices rising and consumers growing more aware of environmental issues, states like Maryland are providing homeowners and contractors with incentives—grants, low-interest loans, and tax credits—to build more energy-efficient homes.

The United States and some of its closest allies are launching a concerted campaign to block a possible return to large-scale whaling and to reverse the gains made by pro-whaling forces in the international commission that regulates hunting of the massive creatures.

The Earth is running a slight fever from greenhouse gases, after enjoying relatively stable temperatures for 2,000 years. The National Academy of Sciences said Thursday that current data are "additional supporting evidence . . . that human activities are responsible for much of the recent warming."

If ambitious plans taking shape in Washington and in state capitals come to fruition, the nation's transportation system may largely run on alcohol produced from biomass, weaning America from foreign oil and the risks that go with it.

Making organic plant food from worm poop and packaging it in reused bottles, Tom Szaky, a 24-year-old Princeton drop-out, built TerraCycle. The company’s fertilizer now sells at Home Depot and Wal-Mart, but the route to such success has not been a straight line.

Energy-efficient buildings, industrial processes, and transportation could reduce the world's projected energy needs in 2050 by one third, and be crucial in controlling global emissions of greenhouse gases, according to the International Energy Agency.

A specific estrogen-like compound, daidzein, appears to be responsible for the healthy effects of soy on cholesterol levels in women, a new study shows.

Teenagers in Los Angeles and New York City face a substantial—and strikingly similar—cancer risk from breathing the air, largely because of toxic chemicals inside their homes and schools.