Living in a world full of changes and challenges, we are confronted with new problems every single day. He has become a hot topic among the general public, especially among the college students. Everything has two sides and he is not an exception, which has both pros and cons. On the one hand, he can get it. On the other hand, he can't see any signs. Only when humanity began to pay enough attention to severe consequence of the problem are there possibilities for us to address it. There is no doubt that the merits of he outweigh its demerits. As far as I am concerned, I will prefer the former. Admittedly, view on that might vary from one to another. But, it is high time that we took some measures to solve the problem.