地球上的大气自然的受到沙尘暴和火山喷发的尘埃和气体的污染。但是最严重的空气污染确实人为的。
The earth's atmosphere is polluted naturally by sandstorms and the dust and gases from volcanoes. but the most serious kind of air pollution comes from people.
意思：我们都知道一个事实，由于我们的贪婪不断增长，我们赖以生存的地方--地球，已经严重受到污染。
We all know the fact that the earth where human beings live has been polluted seriously since our greed became larger and larger .
水是滋养地球上所有生命最重要的元素，可是水资源却受到污染、过度捕捞、和浪费的严重威胁。
Water is the most important element in the world for the nourishment and life of all living things, yet in reality, it is threatened by the effects of pollution, overfishing and waste.
水是滋养地球上所有生命最重要的元素，可是水资源却受到污染、过度捕捞、和浪费的严重威胁。
Water is the most important element in the world for the nourishment and life of all living things, yet in reality, it is threatened by the effects of pollution, overfishing and waste.
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