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Nature 446, 718-221 (12 April 2007) | doi:10.1038/446718a; Published online 11 April 2007

Climate Change 2007: A world melting from the top down

Gabrielle Walker1

  1. Gabrielle Walker is the author of An Ocean of Air.
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Despite years of speculation, little can be said for sure about the future of the Arctic's permafrost. But that's no grounds for complacency, reports Gabrielle Walker.

Some of Phil Camill's trees are drunk. Once, the black spruce trees on the plots of woodland that he monitors in northern Manitoba stood as straight and honest as pilgrims.

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