Everyone wants to reduce pollution. But the pollution problem is (1) complicated as it is serious. It is complicated (2) much pollution is caused by things that benefit people. (3) , exhaust from automobiles causes a large percentage of air pollution. But the automobile (4)_ transportation for millions of people. Factories discharge much (5)_ the material that pollutes the air and water, but factories give employment to a large number of people.
Thus, to end (6)_______ greatly reduce pollution immediately, people would have to (7)______ using many things that benefit them. Most of the people do not want to do that, of course. But pollution can be (8) reduced in several ways. Scientists and engineers can work to find ways to lessen the (9) of pollution that such things as automobiles and factories cause. Governments can pass and enforce laws that (10)_ businesses and traffic to stop, or to cut down on certain polluting activities.