What effect would average population growth have on land usage?
Urban use of land would rise to more than 30 percent of available land.

because there are two types of popn urban and rular urban work for control side and ruler work for moder civilization cities

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.