There will be less polution in the future.

在未来将会有更少的污染。

We will make our city a polution-free zone.

我们要把我们的城市建成一个无污染地区。

What will happen if we keep on causing polution?

假如自己们继续制造污染，将会发作什么呢？

The light polution may interfere with normal growth cycle of plants.

光污染会影响植物的正常生产周期。

Polution which is very harmful to human beings, animals and plants has become a global issue.

污染已成为全球问题，对人类动物，植物有很大危害。