Wind energy has been a fast growing sector of the overall energy market. It is renewable energy that can be produced on an industrial scale that can rival the older established energy sources of coal, gas, oil, hydro, and nuclear. Now, it accounts for only two percent of the whole energy market, but government officials expect wind to produce one fifth of the total electricity supply in the United States by 2030. Proponents claim wind power can reduce the threat of global warming. However, a recent study from the Massachusetts Institute of Technology (MIT) has found that the opposite is true. Mass produced wind farms can actually affect climate in a negative way.