clipped from: creepysleepy.com 
Many chemtrail investigators have evidence that barium salts make up part of the mixture being emitted from these jets. Barium is a dessicant and absorbs moisture. The barium and probably other chemicals may also be used in conjunction with HAARP, which is a joint U.S Air Force and Navy project, to essentially control the weather.
My personal gut feeling is that they are making a continued drought sound plausible so that when farmers begin to lose their land, water rationing begins and possible famine ensues, it will seem as though it was all a natural occurrence.
Considering that Gorbachev and others in the One world Government crowd have declared that the environment and the global warming scenerio will be the cornerstone of the “New World Order.”