11.   But leading scientists warn against putting too much reliance on forests.

12.   But several leading scientists view such positions as premature at best.

13.   But the legislation, though backed by leading scientists, has ignited a bitter brawl in the environmental community.

14.   Dr. John Houghton, a leading British scientist, said he sees no contradiction in the growth of ice in one part of the world and melting in another.

15.   His company, Geron, was able to finance or license the research of many leading scientists in the field.

16.   Here are some of those riddles culled from inquiries with leading scientists in several fields.

17.   In the world of animal research, where breakthroughs are common and publicity is not, leading scientists applaud the work.

18.   Jannasch was among the leading scientists who deciphered the workings of these bizarre creatures.

19.   Last week, a group of leading American nuclear scientists wrote to the Senate urging ratification, if only as a way to block Chinese nuclear espionage.

20.   Leading international scientists will assess existing and emerging hormones, methods of detection, surveillance and health risks.