Let ' s tell you some interesting facts about wind and air .
Did you know that air pollution harms children more than adults .
The world is waking up to the bad effects of fossil fuels like coal , petrolium and natural gas . No wonder then that renewable sources of energy like wind are becoming popular .
Did you know that windmills have a good side and a bad side . The good side is it helps you generate electricity and the bad side is that it is inguring birds .