Although precise comparative studies have not been carried out, there seem to be greater losses amongst terrestrial plant communities than amongst land animals under conditions of high air pollution. By their nature, plants are less able to adapt to sudden changes in pollution levels and climatology than animals, which often have the option of moving or changing food source. For example, in the literature survey referred to above 18 , evidence was found for pollution effects on over three times as many terrestrial plants as animals. Whilst some of these differences may indicate a bias towards certain groups amongst researchers, it accords well with other findings referred to above. This.