Hybrid animals can be created in zoos and laboratories. But mixed-up animal mating is also occurring in nature.
How will China and the U.S. reach their new goals for emissions reductions?
About 178 species including the woolly mammoth and the saber-toothed cat disappeared tens of thousand of years ago. What brought about their demise?
Climate change isn't just about rising tides overtaking land; climate change may destroy vast oceanic ecosystems.
Climate change may not only devastate food crops, but also diminish plants' nutritional value.
Climate change isn't just bad for us land animals. It's bad for sea creatures as well.
55 million years ago, as the Earth heated up, many mammal species got smaller. Could the same thing happen again with human-induced global climate change?
According to geologists, there's something very hot going on under all that ice.
In addition to raising sea levels and wiping out species, climate change may threaten the world's coffee supply.
While climate change is bad for most of us, grizzly bears may not complain too much -- at least in the near-term.