: the pollution is the biggest one problems of this age there are . many kinds of pollution that make life difficult, unhappy and unhealthy. the first kind is the most dangerous one which is air pollution . it is caused by factories and cars the other kind is water pollution .factories pour chemicals into nearest seas . it is also caused by tankers spilling oil those poisonous chemicals and waste make water dirty unhealthy to drink . they also kill fish that people eat. .