21.   Much concern has been expressed that acid precipitation causes a reduction in forest productivity.

22.   Other officials expressed concern that the proposed mechanism might actually prove to make secession impossible in practice.

23.   Over recent years considerable concern has been expressed over the introduction of new diseases caused by bacteria and viruses in particular.

24.   Pearson expressed concern that the new codes would make it easier to develop hillsides and canyons, particularly in older coastal neighborhoods.

25.   People are also being asked to make their voices heard expressing concern over the possible cut to aid to the third world.

26.   Reformers have expressed concern that he could be ousted by hard-liners opposed to his reforms.

27.   Similar concerns have been expressed by high-ranking officials on the East Coast.

28.   Some analysts express concern that the new systems will be less secure and incapable of doing donkey work like batch processing.