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Additional info for Science (Vol. 306, No. 5699, November 2004)

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The two most important processes for the largest deviations ularly during the last glacial perigreat promise to answer this question. are changes in carbonate sedimentation and in the ocean over- od. The data suggest that, assuming constant carbonate over the past 10,000 years of relaReferences flux, the glacial ocean overturned more slowly than it does today. tively constant climate, during 1. W. , Science 306, 1169 (2004). which the radiocarbon cycle was 2. K. , Science 303, 202 (2004). the deep ocean.

Also shown are species known to sci- hit the ground. ’s computational endangered species (falling leaves), and species for which method and verification of its performance compared with computer“barcode” information is available (red leaves). simulated known phylogenetic hisportant implications for future work on the tories and empirically “known” histories Tree of Life. This and other studies demon- will provide further insights into the generstrate the importance of computational ap- ality of mining our genetic databases to asproaches compared with brute-force gene semble the Tree of Life.

5. L. Keigwin, Paleoceanography, in press. mospheric radiocarbon. If this sink were Moreover, the small but growing num6. C. Wunsch, R. Ferrari, Annu. Rev. Fluid Mech. 36, 281 (2004). reduced, the atmospheric radiocarbon con- ber of deep radiocarbon values from the 7. W. Munk, C. Wunsch, Deep-Sea Res. 45, 1977 (1998). tent would rise, and rise fast. If a new Last Glacial Maximum (1, 4, 5) provides in8. R. X. Huang, J. Phys. Oceanogr. 29, 727 (1999). steady state were reached, and the produc- sights into what drives the strength of the 9.

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Science (Vol. 306, No. 5699, November 2004)


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