1.Recently the ...has been brought into focus...Nowhere in history has the issue been more visible. In this essay, I aim to explore this complicated phenomenon from diverse perspectives, identify the relevant contributing factors and bring up some effective measures.

　　2.As far as I am concerned, an array of integrated factors contributes to the ...The first role that should be blamed is...Another equally important factor lies in Last but not least...：

　　3. As a matter of fact, ...gives rise to a host of problems, such as...Confronted with such a thorny issue, people come up with a variety of constructive countermeasures. Personally, the following are worth recommendation... ：

　　4. When everyone is fully aware of the severity and take feasible measures, I firmly believe...