具体如下：
How to protect the environment has become one of the biggest problems in the world .
如何保护环境已成为世界上最大的问题之一。
It"s our duty to protect our environment . No matter where we live , we should do something to keep our neighborhood clean and tidy .
保护环境是我们的责任。无论我们住在哪里，我们都应该做些事情来保持我们的社区干净整洁。
We can collect waste paper or other waste things for recycling. We should plant more trees and we should prevent those factories from pouring waste water into rivers, lakes and fields.
我们可以收集废纸或其他废弃物进行回收利用。我们应该种植更多的树木，我们应该防止那些工厂将废水排入河流、湖泊和农田。
We shouldn"t leave rubbish everywhere and spit in public places . We mustn"t pick the flowers or step on the grass in public.
我们不应该到处乱扔垃圾，也不应该在公共场所随地吐痰。我们不能在公共场合摘花或踩草地。
If everyone tries his best to protect the environment , the world will become much more beautiful and our life will be better and better .
如果每个人都尽力保护环境，世界将变得更加美丽，我们的生活将越来越好。
living on the earth,and we have only one earth.
What should we do for it?I think the following are necessary.We should pick up rubbish and throw it into the dustbin,and we should collect waste things,such as battery,plastic bags and so on.We should plant more trees,flowers and gras s.We shouldn’t litter everywhere.
It’s our duty to keep our environment clean.If everyone can do like this,our world will become much more beautiful.