英语翻译Recently,scientists have become increasingly concerned a

英语翻译
Recently,scientists have become increasingly concerned about pollution and its effects on weather.Actually,man's pollution of the atmosphere is not nearly as great as nature's,In fact,man is the less offender compared to nature itself.Specifically,active volcanoes,evaporation of impure water,and wind erosion of the landscape spew 8.5 billion tons of chemicals into space each year.Man's contribution consists of a mere half billion tons.What man contributes,though,is unable to escape very far into the atmosphere.