1) Many nations have been faced with the problem of …
　　2) Recently the problem has been brought into focus.
　　3) Recently the phenomenon has 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 …, …