A a reult, the population of the world i increaing, cauing tot of problem. Second, becaue of the development of indutry, tot of the wate from factorie pour into the air and river, cauing pollution of att kind. Third, ome terrorit are uing cience and technology againt mankind. They ue biological, chemical and unclear weapon to threaten world peace.
So it urgent that we find way to olve thee problem. But we hould not top the development of cience and technology becaue of thee diater they bring, jut a we hould not give up eating for fear of choking. In addition, we hould make ome rule to regulate our action. A long a we ue cience and technology in a proper way, they may bring u even more benefit.