Gardeners knew it, now scientists have proved it: Weeds really can sniff out tomato plants.

Palm trees in Canada? No ice anywhere? The future could look like Earth's hottest ancient epoch, says a new study of carbon dioxide levels.

It hasn't yet reached biblical proportions, but the plague of locusts currently infesting the resort town of Cancún has some residents looking to the heavens for help.

In a high-tech take on a canary in a coal mine, the U.S. Army is using sensitive bluegill fish to monitor water reservoirs for signs of contamination or attack.

After a '90s lull, the greenhouse gas is rising fast, but drying wetlands are making the situation look better than it is, researchers say.

Spectacled flying foxes in north Queensland were seen leaving en masse just before a March cyclone struck the region, and no one knows where the animals went.

Four amateur explorers have discovered a mammoth cave in California's Sequoia National Park that scientists are hailing as a major find.

Scientists are again saying that they have evidence suggesting the elusive ivory-billed woodpecker is alive and well—this time in Florida's Panhandle.

American robins are the host of choice for mosquitoes that carry West Nile virus, scientists say.

The rabbit-size rodents were once said to be headed for extinction, but now scientists say there are three times more of them on the African island than had been thought.

Find out which factors—from rising temperatures to alien weeds—are creating a recipe for disaster in California's Mojave Desert.

Scale to new heights with this year's winners of the Banff Mountain Photography Competition, and get the photographers' tips for how they created the award-worthy shots.

A provocative new study claims hurricanes such as Katrina and Rita actually help stabilize wetlands by depositing tons of silt and sediment.

Mass migrations of the marine crustaceans stir up ocean waters and may help pump nutrients to the surface waters, according to new research.

Female polar bears weigh nearly 150 pounds (65 kilograms) less on average than they did 25 years ago, because the ice on which they hunt is melting earlier, research shows.