Generally, though, hotter weather means more water evaporates, and regardless of whether the air can hold more or less water, over time the same amount that goe

Generally, though, hotter weather means more water evaporates, and regardless of whether the air can hold more or less water, over time the same amount that goes up will come down, meaning total precipitation will increase as the earth gets warmer. That doesn't mean that this increase will be uniform. The rain may very well come in Sahara, Arabia or Central Asia.