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The federal appeals court ruling is the most recent in a series of judicial setbacks to the Bush administration’s efforts to reshape federal policies under the Clean Air Act.

Mayor Michael R. Bloomberg is seeking to put wind turbines on New York City’s bridges and skyscrapers and in its waters as part of a push to develop renewable energy.

The U.S.S. Oriskany was sunk by the Navy in May 2006 under a pilot program to convert decommissioned vessels into artificial reefs.

Nina V. Fedoroff is science adviser to the secretary of state and contends that genetically modified foods help the environment.

Lance Armstrong’s household has been revealed as one of the biggest individual users of water in a city definitely short on rain.

The decision came after growing anxiety among Democrats that Republicans were scoring politically with their call for a vote on offshore drilling.

The wind industry has arrived in force in upstate New York, but some residents say the companies have brought with them an epidemic of corruption and intimidation.

The weekend brought two of the clearest summer days in recent memory in Beijing, a city where air quality often ranks among the worst in the world.

A growing array of military leaders, Arctic experts and lawmakers say the United States is losing its ability to patrol and safeguard Arctic waters.

Researchers report that the coastal seafloor of many of the world’s oceans can barely sustain marine life due to human activity.

Two California companies plan to build solar power plants 10 times larger than the largest now in service, creating the first utility-scale use of technology mostly confined to rooftops.

General Motors said that it had “essentially finished” designing its first plug-in hybrid car and would have production-ready prototypes within 10 days.

Enterprising attempts at living green in the city can sometimes lead to messy or frustrating blowback.

Diana Beresford-Kroeger brings together Western medicine and botany to advocate for the planting of trees with beneficial properties.

A vigilant defender of Atlanta’s trees has been fired, upsetting tree-lovers in a city where development is rampant.

At what point should we consider the long-term ramifications of technological developments?

The Bush administration is proposing to let federal agencies decide for themselves whether construction projects might harm endangered animals and plants, according to a draft of rule changes.

Dr. Natalie Jeremijenko caters to those who want to know more about what they can do to clean up their personal environment.

Chains are seizing a chance to bolster environmental credentials, and gain a tax advantage, by installing solar roof panels before a Dec. 31 deadline.

Compared to hotels abroad, the American hospitality industry does not yet have much of a culture of saving resources -- but some say changes are coming.