People are naturally going to live near clean water sources, that way it's easier to survive, so people are more likely to live near or in an oasis than in a hot dry area like a desert.
The major source of air pollution that disrupts the atmosphere’s natural cycles is the combustion of <u>fossil</u> fuels.
Prevailing winds are the planetary winds that are caused by the formation of giant convection cells over the earth. Prevailing winds blow from the hot regions of the earth, like the tropics, to the cold areas of the earth, like the temperate or polar regions, and from the cold areas back to the hotter regions.