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1·This could become a big environmental problem.

这可能会成为一个严重的环境问题。

2·Overconsumption by the world's fortunate is an environmental problem unmatched in severity by anything but perhaps population growth.

这个世界的幸运儿所进行的过度消费成了一个环境问题，其严重程度也许只有人口增长问题能与之相提并论。

3·The environmental problem is an economic one substantially.

环境问题实质上是一个经济问题。

4·Environmental problem has become an important and crucial issue.

环境问题已成为一个重要和关键的问题。

5·I think deforestation is the most serious environmental problem.

我认为森林减少是最严重的环境问题。

6·The environmental problem has become the focus of public concern.

环境问题已经成为公众关心的焦点。

7·More and more people are concerning about the environmental problem.

越来越多的人关心起环境问题。

8·Environmental problem is a global problem in face of mankind nowadays.

环境问题是当今人类面临的全球性问题。

9·But an increasing population is an environmental problem in many countries.

但是日益增长的人口是许多国家的环境问题。

10·Environmental problem has already become the attention in the world in 21st century.

环境问题已经成为21世纪各国普遍关注的问题。