1.Many nations have been faced with the problem of ...

2.Recently the problem has been brought into focus.

3.Recently the phenomenonhas become a heated topic.

4.Recently the issue has aroused great concern among ...

5.Nowadays there is a growing concern over ...

6.Never in our history has the idea that ...been so popular.

7.Faced with ..., quite a few people argue that ...

8.According to a recent survey, ...

9.With the rapid development of ..., ...