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 ..., ...