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Behind the scenes: news detective.
The second of a two-part series on climate change.
Melting ice is bad news for polar bears that live in northern Alaska.
Science fair superstar Erica David shows how fences that trap snow can help the environment.
In a world with increasing energy needs, scientists are turning to plants for help in using solar power.
The number of severe hurricanes in recent years may be normal, it turns out.
Scientists are paying increased attention to changes in Earth's polar regions, which are in danger because of global warming.
Rising temperatures and earlier snowmelts in the western United States have intensified forest fires.
By studying population patterns, scientists hope to figure out why moose in some areas are in trouble.
Last year's worldwide average temperature was the highest ever recorded by scientists.
Sediment from Arctic lakes shows that much of the Northern Hemisphere has been warming for many decades.
Global warming may be wiping out some plants and animals or pushing them into new habitats.