"It's a whole new way of thinking about solar energy," says startup CEO about using transparent solar cells on buildings and electronics.

A new compound may help slow climate change by reducing the methane belched by cattle.

Warmer-than-usual water in parts of the Pacific Ocean indicates that a developing El Niño is intensifying and might become one of the strongest on record.

A bombshell climate study due out this week warns that sea levels may rise a catastrophic 10 feet (3 meters) by the end of this century, rather than the currently predicted 3 feet (.9 meters).

Pohamba Shifeta, Namibia’s Minister of Environment and Tourism, said the country will not destroy its stockpile of ivory and rhino horns—a measure adopted by other countries in Africa and elsewhere

Tensions are rising over a large proposed dam that would flood six rural villages—and their microhydro systems—to provide power and water to cities.

As countries build more hydropower projects, new research warns that massive dams pose an extinction threat to mammals, birds and tortoises—at least in the Amazon.

The national parks are pristine emblems of the American wilderness, attracting millions of visitors from around the world.

The oxygen losses accompanying global warming could reduce by 20 percent the amount of ocean suitable for cod and crab by the end of the century, according to the study in the journal Science.

Mozambique lost 48 percent of its elephants from poaching in the past five years—a decline from 20,000 to 10,300—the Wildlife Conservation Society reported on Tuesday.