Global warming strikes again? Snowmelt is swelling rivers earlier and earlier, scientists say. The premature gush could cause havoc for reservoirs and animals.

U.S. governments and private groups kill a reported 80,000 coyotes a year for sheep farmers. They might as well save their time, a new study says.

Forecasters say the Northeast may be the next U.S. region to take a direct hit from a major hurricane, perhaps as early as this summer.

Scientists say they found walrus pups struggling alone in open waters, likely separated from their mothers, as the ice on which they live is melting.

The controversial hunt of harp seals begins this weekend on an unusually shaky stage: floes of shrinking sea ice.

Melting polar ice is flowing into the world's oceans much faster than previously thought, new studies show. By 2100 the Arctic may be as warm as it was 130,000 years ago, the time of Earth's last major melt.

Some 45 billion pairs of chopsticks are chucked every year in China—that's a lot of trees. A new tax aims drive the number down.

Is bird flu the next pandemic? How do humans get it? What happens if they do? Our Frequently Asked Questions separate bird flu fact from fiction.

With health experts warning that bird flu could hit the United States this fall, zoos officials are making plans to protect their valuable bird collections from the deadly disease.

Officials in dog-friendly San Francisco hope to harness the power of methane in dog waste so it can be used for heating homes and generating electricity.

Northern Queensland, Australia, which saw towns leveled and crops destroyed by Cyclone Larry on Monday morning, is bracing for more wild weather as a second tropical cyclone slowly approaches the continent's northeastern coast.

A record oil spill on Alaska's North Slope is raising a new round of questions from environmental groups about proposed plans to open more land in the region to drilling.

For the second year in a row a large amount of Arctic sea ice did not refreeze during the winter as it normally does, a trend that may indicate an overall shrinking of Arctic ice cover due to rapid global climate change.

A group of marine ecologists and social scientists say that marine-life traders who move rapidly between different regions are depleting the world's fisheries at an alarming rate.

A new study adds evidence to the theory that warmer seas have led to stronger hurricanes—but some experts remain skeptical.