There is a lot of controversy regarding these structures. Some argue they are huge and create an annoying visual field amongst other things — see Cape Cod residents unhappy with offshore wind turbines while others will say that in a world full of telephone poles and hydro towers these will hardly be noticed– see a conservative opinion page that says the US government
has always been prioritizing environmental issues.
I believe they are an essential component of the future of energy and now is the preffered time to be taking a good long look at them.
For a review of some of the primary pros and cons concerning wind turbines go to this page from Healthlink.