I think overall, global warming is happening (refer to shrinking mountain glaciers and ice caps for verification) and we should be worried about this fact. But overall I think global dimming is a VERY serious problem. Sunlight levels are the biggest factor on rates of evaporation, much more so than temperature. Also if there are too many particles in the air, rain doesn't form properly and the environment stays hazy without any condensation. I think this is what is causing the worldwide droughts.
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