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Người ta không biết mới hỏi đó thưa bạn. "Không biết phải hỏi, muốn giỏi phải học" mà. Mà bạn nghĩ bạn thông minh hơn ai?
Of course, there are all different kinds of environmental problems and I do not know which problem you want discussed. I will write about global warming.
One of the major environmental problems today is global warming. It is caused by an excess of carbon dioxide in the atmosphere. This causes what is known as a "greenhouse effect."
The major effect of this greenhouse effect is to raise the temperature of the world as a whole. If this continues, climate patterns around the world will change. In addition, sea levels will probably rise, which will be bad for low-lying areas.
There are many possible solutions, all of them have to do with emitting less carbon dioxide -- either by using less energy or by finding energy sources that do not emit carbon dioxide.