It's Us

This video segment from 'Earth: The Operators' Manual' explores how we know that today's increased levels of CO2 are caused by humans burning fossil fuels and not by some natural process, such as volcanic out-gassing. Climate scientist Richard Alley provides a detailed step-by-step explanation that examines the physics and chemistry of different "flavors" or isotopes of carbon in Earth's atmosphere.

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Geoff Haines-Stiles Productions
EARTH
The Operators' Manual
Video length: 2:75 min.

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Excellent quality.

This segment is from the hour-long episode but stands alone quite well.

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