People have ____ polluted their surrounding.
The problem has become more important_____.
People have become alarmed with the danger of pollution____
_____ are necessary for existence of all living things.
Polluted air can cause illness, and even death.
_____ are important for growing crops but they can ruin soil.
People would have to stop using many useful things if they wanted to end pollution immediately
Scientists and engineers can not find the way to reduce pollution from automobiles and factories
Pollution can not be reduced gradually.
Our government can pass the laws that would make enterprises take measures for reducing of pollution
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