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

12 To solve the above-mentioned problem, we must ...

13 In summary, if we continue to ignore the above-mentioned issue, more problems will crop up.

14 With the efforts of all parts concerned, the problem will be solved thoroughly.

15 Nowadays there is a growing concern over ...

16 In conclusion, it is imperative that ...

17 There is no easy method, but ...might be of some help.

18 We might do more than identify the cause ; it is important to take actions to ...

19 Taking all these into account, we ...

20 Whether it is good or not /positive or negative, one thing is certain/clear...