Re: Do dust particles in air supersaturated with moisture help cause rain?

Yes. The probability that a large number of water molecules in saturated air will combine to spontaneously form a liquid droplet is very small. It's much easier for the molecules to bump into a dust particle and stick to it: after a few billion others do the same, a droplet starts to grow. These dust particles, called "condensation nuclei", are about 1 micron or so in size. Over the oceans, where dust is not available, tiny salt crystals formed from evaporated sea-spray serve as condensation nuclei.

In some cases, artificial rainfall can be produced by using airplanes to dump condensation nuclei into moist (but dust-free) air.

You are correct in suggesting that changes in the number of cloud condensation nuclei could change climate. However, wars are not the biggest man-made process to generate them. Soot particles from industrial pollution make very good condensation nuclei. There is some concern that increased industrial activity could increase the amount of cloudiness over the whole Earth. While this might increase raininess, it could also partly counteract the greenhouse effect by reflecting more sunlight to space.