wind energy is free, renewable resource, so no matter how much is used today, there will still be the same supply in the future. wind energy is also of clean, non-polluting, electricity. unlike conventional power plants, wind plants emit no air pollution or greenhouse gases. according to the u.s. department of energy, in 1990, california's wind power offset the emission of more than 2.5 billion pounds of carbon dioxide, and 5 million pounds of other pollutions that would have otherwise been produced. it would take a forest of 90 million to 175 million trees to provide the same air quallity