1.   But scientists increasingly believe that it is one of the chief pollutants responsible for the greenhouse effect warming the planet.

2.   Government scientists believe the action of sea water will destroy the bacteria.

3.   Many scientists now believe that birds evolved from dinosaurs.

4.   Most scientists believe it is legitimate to use animals in medical research.

5.   Scientists believe that whale song is used to communicate.

6.   Scientists believe the suppressor gene can be inactivated by tobacco, viruses, pollution or diet.

7.   Scientists believe they are close to finding out the truth about the origins of the universe.

8.   Some scientists believe that it can take up to a thousand years for virgin forest to be truly established.

9.   Subsequent studies have come to less clear conclusions, and a few scientists believe that the monkey results are explained by chance.