Two photographers who took shocking images of emaciated polar bears talk about their experiences and what the images might mean.
Close to one-third of the planet's fish stocks are overfished and one in four species of sharks, rays and skates are threatened with extinction.
While there have always been good and bad years for polar bears, scientists expect that there will be more bad years as the Arctic warms.
The runaway bees bred with local populations of European honeybees, and their hybrid descendants spread and are now on the move in the United States.
Past climate change had a huge impact on the ancestors of today's canines.
See the several butterfly species that are predicted to go extinct in our lifetimes.
Some like it hot, but woolly mammoths and giant sloths didn’t, helping to explain why these animals and other big beasts from the last Ice Age went extinct.
About a third of bumblebee species are dying off, some up to 90 percent of the population. Continue reading →
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