The Animals Of AntarcticaAntarctica is the most inhospitable place on Earth. Certain creatures survive there, though global warming can threaten their natural habitats.
The Ice Of AntarcticaAntarctica, the coldest place on Earth, is feeling the effects of global warming. See the view from the bottom of the Earth.
Our Country's National ParksNational Parks preserve some of America's most interesting and unique environments. Take a trip to these national treasures.
Lights Out For Earth Hour 2011See how the world celebrates Earth Hour, which encourages peoples around the world to turn off their lights for one hour at 8:30 p.m. local time on March 26, 2011 to take a stand against climate change.