Why can't we control droughts?

Well, actually some degree of droughts may be man-made. Recently, the show Nova (PBS) had an episode on global dimming. Global dimming is caused by pollution in the air blocking out the sun's energy. It has masked global warming, which is now believed to be much worse than previously thought. While much of meteorology is still guess work, the principles behind global dimming are based on testable hypotheses-- They can test evaporation rates, and measure pollution in the air, etc. This global dimming may be responsible for disrupting global weather patterns, and may be responsible for some of the African droughts-- You can check it out more at ...