In class we discussed the climate sensitivity:the amount of warming that would result from a doubling of atmospheric carbon dioxide.We used the equation for radiative forcing due to carbon dioxide:

Alog(Q/Q0),

where Q0is the carbon dioxide concentration at some reference time (taken to be 270 ppmv - the concentration of atmospheric carbon dioxide at the start of the industrial revolution.

Calculate the constant A if the climate sensitivity is 2 degrees Celsius.Then use this to predict the amount of warming that is expected at the current level of carbon dioxide concentration (410 ppmv).