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National Science Foundation
How Do We Know? Physics, Forcings and Fingerprints
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How do we know the climate is changing? Is it just part of a natural cycle, or are humans driving the change? Some of the world's leading climate scientists explore these questions, laying out the line of reasoning that has led the International Panel on Climate Change and many other scientific groups to conclude that humans are very likely the cause of the majority of current warming. Glaciologist Richard Alley leads a lively exploration into the fundamentals of climate change and peers into the treasure trove of the deep past to see what might lie ahead in a warmer world.

Credit: National Science Foundation