The American government estimates the some 60,000 American die each year from reparatory disease which are caused by air pollution. The situation in the cities like Los Angeles, Katmandu, Mexico and Shanghai is even worse. This situation could be improved by controlling pollution and population With the growth of population, the world faces the problem like desertification, depletion and the green house effect. So the more people the world has, the more severe these problems are likely to become. The examples of Germany and Sweden show that pollution can be reduced
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