Is there a limit to the amount of energy which can be extracted from the wind? There are a huge number of windfarms springing up around the world.. all taking energy from the wind. The assumption seems to be that this is limitless and "free". Clearly this is not possible. The question is (I think) - how will the transfer of energy (from the wind) manifest itself on the climate, and could the impact be measured? The only research I have seen to date, relates to finding the "best" location for a windmill, and some on the effect on local weather conditions.