Exploratorium
Exploratorium: Global Climate Change: Research Explorer
Explore scientific data relating to the atmosphere, oceans, areas covered by ice, and living organisms in all these domains. Interpret past and present climate data to predict future climate change and its possible effects.
University Corporation for Atmospheric Research
Ucar: Why Does Climate Change?
Factors that have the power to change global climate can be natural, like volcanic eruptions and changes in solar energy, or caused by humans, like the addition of greenhouse gases to the atmosphere.
Other
Arm Program's Education Center: Global Warming
An all purpose site with something for everyone. Learn about global warming and climate change, ask a scientist, take a quiz, or get a lesson plan!