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 sending out smoke. this kind is commonly found industrial and big cities. in such cities ,air is not clean and unhealthy.
the other kind is water pollution .factories pour chemicals into nearst seas and rivers. it is also caused by tankers spilling oil or towns pouring waste. those poisonous chemicals and waste make water dirty and unhealthy to drink . they also kill fish that people eat.
many countries work hard to stop pollution and thy cucceeded. air and water on their cities become much cleaner. they now breathe and drink fresh and healthy air and water.