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| | Climate Change and Greenhouse Gases |
 | | Fan, S., M. Gloor, J. Mahlman, S. Pacala, J. Sarmiento, T. Takahashi, and P. Trans, A large terrestrial carbon sink in North America implied by atmospheric and oceanic carbon dioxide data and models, Science, 282, 442-446, 1998. |
 | | These anthropogenic sources of CO exceed the estimated uptake of CO by the atmosphere and oceans, implying a significant but as yet unidentified terrestrial sink [ Enting and Pearman, 1987]. |
 | | Etheridge, D., L. Steele, R. Langenfelds, R. Francey, J. Barnola, and V. Morgan, Natural and anthropogenic changes in atmospheric CO over the last 1000 years from air in Antarctic ice and firn, J. |
| www.agu.org /eos_elec/99148e.html (620 words) |
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