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Volume 473 Issue 7347, 19 May 2011

The Canadian Arctic Archipelago contains one-third of the global volume of land ice outside the ice sheets, but its contribution to sea-level change is largely unknown. Gardner et al. use three independent techniques to reveal that mass loss from the archipelago was 92 ±12 gigatonnes per year in 2007–09, about three times greater than in 2004–06, and coincident with warmer summer temperatures. The record is too short to allow a firm conclusion on longer-term trends, but it is clear that the Canadian Arctic Archipelago is a significant contributor to sea-level rise. On the cover, an englacial melt channel within the Devon Island ice cap. Photo credit: Angus Duncan.

Volume 473 Issue 7347

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  • Conservationists predict massive extinctions as a result of habitat loss. Habitat loss undoubtedly does drive extinctions, but dealing with an unmet assumption that underlies these predictions yields much lower estimates. See Letter p.368

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