Everyone wants to reduce (1)_________________. But pollution problem is as complicated as it is serious. It is complicated (2)______________much poll

Everyone wants to reduce (1)_________________. But pollution problem is as complicated as it is serious. It is complicated (2)______________much pollution is caused by things that benefit people. (3)____________ example, exhaust from automobiles (4)_____________ a large percentage of all air pollution. But automobiles (5)________________ transportation for millions of people. Factories discharge much of the material which (6)____________ the air and water, but factories give employment to a large number of people. Too much fertilizer or pesticide can ruin soil, but fertilizers and pesticide (7)____________ important aids to the growing of crops. Thus, to end (8)______________ greatly reduces pollution immediately, people would have to (9)______________using many things that benefit them. Most people do not (10)______________ to do that, of course. But pollution can be gradually