The left will not bring this up until we have 100% dependence on windmills, then they will pull the rug out to create a new crisis.
There has to be a local effect as a minimum. The large scale impact of slowing the winds will be an interesting study.
For every action there is an equal and opposite reaction.
Nothing is for free, and all processes are less than 100% efficient.
These are some of the basic truths of nature the left doesn't understand.
Then, I think it is feasible, as a reaction to the AGW theory, that WINDMILLS CAUSE AGW, too!!!!!!!! Hahahahhaahahaa