Graduate School of past tests 3
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21,オゾンは成層圏において紫外線の作用により酸素から生成する
The ozone is generated from oxygens by ultraviolet reaction in stratoshpere.
22,オゾン層の破壊は地球上の生物や人間にとって脅威を与える
The ozone layer destruction threaten to living things and humans on the earth.
23,森林の再生には長い時間が必要であり、多くの課題を有している
Reproduction of the forest need a long time and involve a lot of problem.
24,水は人間の生活や産業にとって欠かすことのできない最も貴重な資源である。
The water is essential the most important source by human life and industry.
The ozone is generated from oxygens by ultraviolet reaction in stratoshpere.
22,オゾン層の破壊は地球上の生物や人間にとって脅威を与える
The ozone layer destruction threaten to living things and humans on the earth.
23,森林の再生には長い時間が必要であり、多くの課題を有している
Reproduction of the forest need a long time and involve a lot of problem.
24,水は人間の生活や産業にとって欠かすことのできない最も貴重な資源である。
The water is essential the most important source by human life and industry.

Ozone is generated from oxygen in the stratosphere by an ultraviolet reaction.
The destruction of the ozone layer threatens living things and humans on the earth. (Another way to write this that will make it sound better would be this "The destruction of the ozone layer threatens all life on earth." But the changes I made keep more of what you wrote originally.
Reproduction of the forest need a long time and involve a lot of problem. (Not really sure what you mean here and Google translate isn't helping with the Japanese... I think you mean to say "Regrowth of the forests will take a long time and is a difficult problem to solve.")
Water is the most important source for human life and industry.