With industries and business developing quickly, the number of trees in many big cities has dramatically reduces. Efforts are being made to prevent people from cutting more trees. But a lot of trees are being destroyed by people who have never thought of the importance of green plants.Making cities greener has many advantages. First, it can make our air cleaner. Some researchers have proved that trees can reduce the amount of carbon dioxide in the atmosphere through absorption. Second, it can make our cities more beautiful. With trees and flowers everywhere, living conditions can be improved.
Finally, it can produce timber—-an effective way to solve the problems of limited supply of natural resources.Making our cities greener requires nationwide efforts. People in every field should not only know about the importance of keeping the quality of urban environment, but also take common action to plant more trees and flowers so as to improve our living conditions.
翻译：
随着经济的快速发展，树木的数量在许多大城市里已经急剧减少。正在作出努力防止人类砍伐更多的树。但许多树木正在被那些永远不会想到绿色植物重要性的人摧毁着。绿化城市有许多优点。第一，它可以使我们的空气更加清新。一些研究人员已经证明，树木可以通过吸收减少大气中的二氧化碳量。其次，它可以使我们的城市更加美丽。树木和鲜花遍地，生活条件得到改善。
最后，它可以生产木材—-一个有效解决有限自然资源供应问题的方法。使我们的城市绿化需要全国的努力。在各个领域的人们不应该只知道保持城市环境质量的重要性，而且还采取共同行动，种植树木和花草，以改善我们的生活条件。
