Michael J. Critelli, executive chairman of Pitney Bowes, discusses unsolicited mail and its affect on the environment.

Dynegy, a major owner of coal-burning power plants, has agreed to tell investors more about how global warming could affect its business, the New York State attorney general said.

Wal-Mart plans to announce that it will require manufacturers supplying goods for its stores to adhere to stricter ethical and environmental standards.

Fears of a sharp worldwide economic slowdown are threatening a hard-won European plan on climate change.

“Design thinking” focuses on people’s actual needs rather than trying to persuade them to buy into what businesses are selling.

The automaker said that it would put an electric car on sale in North America in 2010, putting it neck and neck with General Motors in the race to put a mass-produced electric vehicle on U.S. roads.

Solar power, with its promise of emissions-free renewable energy, boasts a growing number of fans. Some of them, it turns out, are thieves.

Spurred by rising costs for electricity, energy visionaries are making a new push to overcome the barriers blocking ocean-power technology.

Ten states are about to undertake the nation’s most serious effort yet to tackle climate change, but there are worries that it may fail to reduce pollution.

For years, wind-farm projects had stalled in the face of local political opposition. Then an entrepreneur named Peter Mandelstam came up with a new and energizing approach.