Global warming is when the earth heats up (the temperature rises). It happens when greenhouse gases (carbon dioxide, ..

EPA Climate Change Kids Site: Earth has warmed by about 1ºF over the past 100 years. But why? And how?

Global Warming Research. Learn about the causes and effects of global warming. Consider possible global warming ..

The history of research on climate change from the 19th century to the present, told in a set of hyperlinked essays.

Official An Inconvenient Truth Global Warming Documentary Movie Site: Learn about Al Gore, Global Warming Truth, ..

Global warming is already disrupting people's lives. Get a preview of life on a hotter planet. ..

Learn about Global Warming at National Geographic. Get facts, news, wallpapers, watch videos, and learn about ..

NRDC: What it is, how it's caused, and what needs to be done to stop it.

Global warming is an increase in the average temperature of Earth's surface. Since the late 1800's, the global ..