4) Wind energy can harm migrating birds would be the correct answer. Wind turbines pose a huge threat to birds because they collide with the turbine blades.
1 and 3 are not true. And while 2 is somewhat true because building wind turbines is somewhat costly, wind energy is usually used in areas that meet a wind speed requirement, so that its benefits outweigh the costs. Addtionally, its much cheaper than other forms of energy.
