Of course. That’ll teach me to do calcs after midnight and too many glasses of wine!

]]>You’re absolutely right that the net effect is zero and that is what the paper found. There is a corresponding cooling in the upper atmosphere, much like the cooling in the stratosphere due to increased greenhouse effect.

]]>So the wikipedia number is more likely to be accurate.

Re-doing your calculation, I got the Wikipedia number. I’m guessing you assumed there were one thousand square meters per square kilometer, when in fact there are a million sq meters per square km.

]]>Then I found another wiki article which addresses the issue directly (http://en.wikipedia.org/wiki/Waste_heat#Anthropogenic_heat) and it quotes an anthropogenic waste heat flux of 0.028W/m2. Much smaller. Strangely it looks like it’s a factor of a thousand out. Can you see any error in the logic or arithmetic?

]]>