CR 13:149-164 (1999)  -  doi:10.3354/cr013149

Environmental effects of increased atmospheric carbon dioxide

Willie Soon1,*, Sallie L. Baliunas1, Arthur B. Robinson2, Zachary W. Robinson2

1Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138, USA
2Oregon Institute of Science and Medicine, 2251 Dick George Road, Cave Junction, Oregon 97523, USA
1For the purposes of discussion in this paper, we will use carbon dioxide as a surrogate for itself and the other minor GHGs that have been associated with the global warming hypothesis. Greenhouse warming models usually assume that the input of all the minor GHGs produces an effect roughly twice that of CO2 alone

ABSTRACT: A review of the literature concerning the environmental consequences of increased levels of atmospheric carbon dioxide leads to the conclusion that increases during the 20th century have produced no deleterious effects upon global climate or temperature. Increased carbon dioxide has, however, markedly increased plant growth rates as inferred from numerous laboratory and field experiments. There is no clear evidence, nor unique attribution, of the global effects of anthropogenic CO2 on climate. Meaningful integrated assessments of the environmental impacts of anthropogenic CO2 are not yet possible because model estimates of global and regional climate changes on interannual, decadal and centennial time scales remain highly uncertain.

KEY WORDS: Global warming · Carbon dioxide · Atmospheric and biological effects

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