参考答案：One possible version

Life in the future: for better or worse？

Many students are optimistic(乐观的) about thenext fifty years. In fact, they think that the world will be a better placethan it is now and our lives will be greatly improved. As a result, people willhave a higher standard of living and live longer.

However,other students are worried about the future. They say the world become morecrowded. Therefore, we will have even more environmental problems live in aworld with less energy available.

But in my opinion, I think we will find ways to solve our problems and everyone live more happily.