The IPCC goes into substantial detail on cost estimates for mitigation, in brief: > Stabilizing CO2 concentrations at around 445 to 535 ppm, limiting the longt

The IPCC goes into substantial detail on cost estimates for mitigation, in brief: > Stabilizing CO2 concentrations at around 445 to 535 ppm, limiting the longterm temperature rise to about 3.6 to 5.4°F (2 to 3°C), is estimated to reduce the cumulative growth in global GDP 3 percent by 2030. This is equivalent to only a 0.12 percent reduction in annual growth rate of GDP. More importantly 'what it would cost' is pernicious to calculate. Especially when 5% of global GDP could conceivably be a huge number of people: http://www.fivethirtyeight.com/2009/06/how-to-destroy-almost-half-planet-for.html http://www.fivethirtyeight.com/2009/06/how-to-destroy-almost...