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1. Looking back, we may find that harmony used to exist between people and nature.
2. How important and necessary for us to keep the balance of nature and protect the environment.
3. Some videos help scientists see the effects of climate change.
1. 有时为了经济增长，我们牺牲环境；如果这种情况继续下去，环境早晚会被毁掉。
Sometimes we sacrifice environment for the increase of economy; if it goes on, the environment will break down sooner or later．
2. 许多人支持这一政策，因为它不仅能帮助减少污染，还能给这个国家带来许多好处。
Many people are for the policy because not only can it help reduce the pollution, but it also brings many benefits to the country.
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