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Wednesday, June 15, 2011

Climate change: How do we know?

Climate change: How do we know?

Variation in carbon dioxide concentration during the past 400,000 years (historical data from the Vostock ice core).
This graph, based on the comparison of atmospheric samples contained in ice cores and 
more recent direct measurements, provides evidence that atmospheric CO2 has increased 
since the Industrial Revolution. Source: NOAA

http://climate.nasa.gov/evidence/

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