Answer:
b.reduction in secondary pollutants
Explanation:
Global warming is mainly due to increase in the concentration of air pollutants primary and secondary, they are impurities added into the air. The primary are directly emitted into the atmosphere and the secondary pollutants are formed chemically or physically reaction of primary pollutants in the air, for example ozone. Air pollution includes greenhouse gases. With global warming there is increase of air pollutants primary and secondary.
