There was a time when most people in this world can fill them up. And the most important problem has been switch poverty to the environment. The problem is so serious that it has influenced our life all the time. As far as I concerned, the problem will be resolved in my lifetime. The key factor in success of solving the environmental problem is that more and more power has to add in this area. The environment problem is the essentially solved. The uniqueness quantity will attract more investment in this area. The solar battery is a prime example of this situation. In a the solar battery lab, there are more than 50 subjects in one years, and the investment is a plenty of money. the money of One of the subject's investment is 10000 RMB. So the uniqueness quantity functions as a catalyst for a chemical experiment. Aside from the investment, the sole cause of solving the environment problem is the speed of development in this area. In America, a lab has invented a battery with no pollution. The batter only discharge water. But the bad news is the battery is not quite stable. It may be shut down in low temperature. And it is really expensive. However, we have seen the light of it.Many countries have switched their structure of industry. The third industry is exactly the lowest pollution to the environment. At the same time,we have to clear that it's going to be a long way to solve the problem. We will be challenged in many areas. The pollution is not as easy as we might suppose. But I am quite sure that it will be solved in my lifetime.