Last week, I along with my classmates was asked to attend a lecture, the theme of what was environmental protection. It was given by an university professor. The professor first had us to come up with some problems the earth was faced with. Then he offered some suggestions on what they could do to save our planet in an effectively way. Late after the lecture, I searched the Internet for more informations on this topic. Up to now，I learnt that the problem of air pollution is universal and that we were likely to run out of some natural resources. To make things worse , climate change is becoming a great threat for human beings.