one possible version:
Life in the future:for better or worse?
Many students are optimistic(乐观的)about the next fifty years.In fact,they think
that the world will be a better place than it is now and our lives will be greatly improved.
As a result,people will have a higher standard of living and live longer.
However,other students are worried about the future.They say the world will
become more crowded.Therefore,we will have even more environmental problems and
live in a world with less energy available.
But in my opinion,I think we will find ways to solve our problems and everyone will
live more happily.