Freezing one gram of water releases 80 calories of sensible heat into the atmosphere. Condensation of one gram of water releases 540 calories of heat into its sensible form. Sublimation of one gram of ice into gas releases 720 calories of sensible heat into the atmosphere. Condensation of one gram of water releases 80 calories of sensible heat into the atmosphere. Sahara Desert in North Africa 50.
Automobiles causes all of the above pollution.