Что-то вроде того наверно требуется:
- I think tons of rubbish outside the cities is one of the most important issues today.
- It is, indeed. Instead of throwing away rubbish, we should recycle it.
- I think the issue of how to save endangered species is one of the most important today.
- It is, indeed. Instead of hunting, we should adopt endangered animals.
- I think air pollution is an important issue today.
- It is, indeed. Instead of destroying parks and gardens we should protect their trees.