The raw heat output of humanity divided by area of earth. GHG is bad because it produces single digit watts of forcing (captured solar heat that would otherwis

The raw heat output of humanity divided by area of earth. GHG is bad because it produces single digit watts of forcing (captured solar heat that would otherwise escape). Direct thermal forcing from either capturing sunlight (making the surface darker) or emitting heat from nuclear derived (or in short term, fossil fuels before they run out) sources is just as catastrophic, but further off. We can happily replace our current energy needs with nuclear and renewable, but we're just back at square one if we don't end growth.