CÁC BẠN GIÚP MK VỚI : Many people still believe that natural resources will never be used up. Actually, the world's energy resources are limited. Nobody knows exactly how much fuel is left. However, we also should use them economically and try to find out alternative sources of power. According to Professor Marvin Burnham of the New England Institute of Technology, we have to start saving coal, oil and gas before it is too late; and solar power is the only alternative. However, many people do not approve of using nuclear power because it's very dangerous. What would happen if there was a serious nuclear accident? Radioactivity causes cancer and may badly affect the future generations. The most effective thing is that we should use natural resources as economical as possible. 1. Do we know exactly how much fuel is left? 2.According to Professor Marvin Burnham, what do we have to do? 3.Why do many people disapprove of using nuclear power? 4.What does radioactivity cause?