On a massive scale, wind "farms" could, perhaps, alter local wind-climates (at the surface), which may also have some interesting effects on local ecosystems.

Yes, I provided that link a few days ago :

Sow the Wind, Reap the Drag Coefficient (Dept. of "We are as gods, and might as well get good at it")

The main conclusion of the article seems to be that wind power would help with global warming, both by reducing CO2, and by shifting the balance between the poles and the middle latitudes.