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| | Climate Change and Greenhouse Gases |
 | | Several recent proxy temperature reconstructions have suggested that the warming during the twentieth century is greater than any seen in the last 400 to 600 years [Briffa et al., 1998; Jones et al., 1998; Mann et al. |
 | | Overpeck, J., K. Hughen, D. Hardy, R. Bradley, R. Case, M. Douglas, B. Finney, K. Gajewski, G. Facoby, A. Jennings, S. Lamoureaux, A. Lasca, G. MacDonald, J. Moore, M. Retelle, S. Smith, A. Wolfe, and G. Zielinski, Arctic environmental change of the last four centuries, Science, 278, 1251-1256, 1997. |
 | | Overpeck, J. T., How unprecedented is recent Arctic warming: A look back to the Medieval Warm Period (abstract), Supplement to Eos, Transactions, 79 (45), F833-F834, 1998. |
| www.agu.org /eos_elec/99148e.html (7729 words) |
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