NASA
Nasa: Climate Change: How Do We Know?
Provides extensive evidence of the many ways scientists have observed and recorded climate change on a rapid, global scale. Lists different events observed, such as receding ice sheets and evidence in rocks, and presents graphs, images,...
PBS
Pbs Learning Media: Climate Change
This video segment adapted from NOVA explains the difference between weather and climate and features groundbreaking analysis revealing that Earth's climate has changed much faster than previously believed. [5:48]