21.   But an enormous, forested landscape has been destroyed and will take decades to regenerate.

22.   But experts say they have left a mighty imprint on this society that may take decades to dissolve.

23.   But if the flooding continues to kill trees on a widespread basis, the recovery could take decades.

24.   But Glenmullen said it took decades for doctors to recognize the extent or severity of the reactions.

25.   But it would take decades for the old opinions to fade.

26.   But it would take decades to try to open up every Japanese industry, one at a time.

27.   But the dreams for football could take a decade to come true, she said.

28.   But with the various smoothing mechanisms built into the accounting rule, that can take decades.

29.   But, they caution, it could take decades.

30.   Careers used to follow logical paths, and industries took decades to evolve.