Environment.nationalgeographic.com,environment.about.com thease are the two sites where u can find article on global warming

the effects of rising temperatures arent waiting for some far-flung future. Theyre happening right now. Signs are appearing all over, and some of them are surprising. The heat is not only melting glaciers and sea ice, its also shifting precipitation patterns and setting animals on the move.

Some impacts from increasing temperatures are already happening.

Ice is melting worldwide, especially at the Earths poles. This includes mountain glaciers, ice sheets covering West Antarctica and Greenland, and Arctic sea ice.

Sea level rise became faster over the last century.
Some butterflies, foxes, and alpine plants have moved farther north or to higher, cooler areas.
Precipitation (rain and snowfall) has increased across the globe, on average.