As a pilot who works below 500ft everyday, i think that the wind turbines themselves arent a huge hazard. Its the monitoring towers placed on or in the general area (or just at random wherever they thought was a good site) that pose the greatest risk to safe aviation. These things are basically unmarked (except the smallest of marker balls that you have to be within 100m of to see) and unlit. On any given day the are almost invisible to the human eye, even when you know they are there......somewhere!!!!
Whether they are a safe, environmentally friendly way to produce power, well......................depends on which 'expert' you believe.
