Cook goes full stupid and shoots himself in the foot.
He argues that Hansen’s predictions failed because humans have greatly reduced their output of GHG’s other than CO2. He also argues that CO2 is a minor component relative to the other man-made GHG’s.
the main difference between the various Hansen emissions scenarios is not due to CO2, it’s due to other greenhouse gases (GHGs) like chlorofluorocarbons (CFCs) and methane (CH4), whose emissions have actually been below Scenario C (Figure 1). In fact, more than half of the Scenario A radiative forcing comes from non-CO2 GHGs.
Cook is claiming that the most important greenhouse gases have been reduced by more than 80% below what Hansen forecast.
Then he produces a graph showing that temperatures are below Scenario C.
This is what Hansen said about Scenario C :
“Scenario C assumes … that the net climate forcing ceases to increase after the year 2000”
In summary, Cook is arguing that man has already cleaned up the most important GHG’s, and that temperatures are lower than if man had produced no GHG’s since the year 2000. We can conclude from his argument that the world has far exceeded its Kyoto GHG reduction targets, and that temperatures are rising very slowly.
Time for everyone to come home from Rio, and find a different way to repress and rob the citizenry.