In my opinion, air pollution caused by chemical substances can be controlled or inhibited, but will decrease decrease, until it can not cause global warming now is tough.
In my opinion, the air pollution caused by chemicals. Ability to control or inhibit the decrease. But it can not be reduced to cause global warming, it is a difficult thing.
In my opinion, the air pollution caused by chemicals. To control or restrain to decrease. But to drop until can"t cause global warming. It"s difficult.