I am in favour of wind farms because I see them as a small part of the answer to the greenhouse problem, but they are not all good (you can't make an omelette without breaking eggs).
One of my greatest concerns is the number of bats that might be killed by collisions with turbine blades. I'm certainly not an expert on the subject, but can imagine that bats would follow clouds of night-flying insects and these might fly high enough to go through the blade area of wind turbines; also, the bats would not have reason to watch out for objects travelling at several hundred kilometres per hour.
Does anyone know more?
