今年是第49个地球日，我认为我们应该呼吁人们不要过度砍伐树木。
This year is the 49th Earth Day and I think we should call on people not to cut down too many trees.
几个世纪以来，人类过度砍伐树木及过度集约耕作，一直在破坏环境。
Humans have been damaging the environment for centuries by overcutting trees and farming too intensively.
过度砍伐树木，可能导致全球气候的变化。
Cutting too many trees may contribute to global climate changes.
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