Do Climates Change? Is Climate Changing Now? Causes of Change
Is Current Change a Problem? Future Climates What Can Be Done?
Global Warming refers to the gradual increase in global temperature since roughly 1900, the midst of the Industrial Revolution. There have been periods of natural warming throughout Earth's history, but science indicates that current warming is an acceleration of natural cycles due to human activity.

The pages in this section will explain our current understanding of global warming, past and present.
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