It is generally believed that is a hot topic which is widely talked about both at home and abroad.Now our government attaches great importance to solving this problem.Scientists in this field have put forward a number of suggestions tending to relieve it.To begin with , we should Furthermore, It is clear that People , however , differ in their opinions on this matter.Some people think that According to them , all of us should Others argue that In their opinion, nobody can without There is no doubt that As a consequence,.In short, I firmly support the view that It is because So my conclusion is that（110个单词）