Clouds and rain occur when dust and airborne micro-organisms serve as crystalization sites for water vapor. There's actually a positive feedback loop where the

Clouds and rain occur when dust and airborne micro-organisms serve as crystalization sites for water vapor. There's actually a positive feedback loop where the more life there is (in, for instance, a rain forest), the more rain occurs there, as plants emit various pollens and atomized oils into the air. Similarly, if you destroy ecosystems and decimate biomass, there is nothing in the air for water vapor to glom onto and you will soon have a desert. I have an ongoing disagreement with a good friend that the drought in Lion King was caused by Scar's poor ecosystem management, she insists it was coincidence.