Highest CO2 and Methane in 800,000 Years
May 19, 2008 | Posted by Lisa Moore in Science - General
This post is by Lisa Moore, Ph.D., a scientist in the Climate and Air program at Environmental Defense Fund.
In IPCC’s Third Assessment Report (2001), scientists reported that carbon dioxide (CO2) and methane levels were higher than at any time in the past 420,000 years. In their latest report (2007), IPCC scientists raised the number to 650,000 years.
Last week, scientists again revised the number upward. New research shows that CO2 and methane levels are higher today than they have been in at least 800,000 years.
Here’s how they know.

Last week, NOAA released some disheartening numbers: both
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This post is by Sheryl Canter, an Online Writer and Editorial Manager at Environmental Defense Fund.
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