(Chart Reference: https://en.wikipedia.org/wiki/Atmospheric_methane#mediaviewer/File:Atmospheric_CO2_CH4_Degrees_Centigrade_Over_Time_by_Reg_Morrison.jpg)
In the above chart, Reg Morrison, a climate scientist in Australia, compares three sets of data on one time scale of 420,000 years:
1. atmospheric carbon dioxide (CO2) concentrations
2. atmospheric methane (CH4) concentrations
3. global average temperature variation from the present in degrees C.
[As you can see, CO2, CH4 and Earth's temperature follow a nearly identical path. The shock comes from noticing that the current 400ppm (and quickly rising) concentration of CO2 indicates we have already arranged for a minimum increase of global temperatures of 4 degrees C above normal.]
CO2 has hovered around 280ppm for the past 12,000 years, and has not been over 400ppm for 15 million years, when sea levels were at least 25 meters higher, temperatures were at least 3 degrees C warmer, and there was no arctic sea ice. (Reference: http://phys.org/news174234562.html)
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