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Originally Posted by TheEnemy
So what concentration of CO2 do you think we will achieve before we stabilize?
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The figure often used is 450ppm - you have to real the small print though as some of these refer to CO2 "equivalents"
which can include positive and negative factors (PDF) :
Quote:
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Originally Posted by IPCC
• Atmospheric carbon dioxide reached 379 ppm in 2005 and was increasing by around 2 ppm per year.
• Including the effect of all long-lived greenhouse gases such as methane, the total concentration of atmospheric greenhouse gases was around 455 ppm carbon dioxide equivalents in 2005 (range 433-477 ppm).
• However, the cooling effects of aerosols and landuse changes reduce radiative forcing so that the net forcing of human activities was about 375 ppm carbon dioxide equivalents for 2005 (range 311-435 ppm).
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How to do this is tricky.