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Nature 446, 24 (1 March 2007) | doi:10.1038/446024c; Published online 28 February 2007

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Never mind the footprint, get the mass right

Paul Jarvis1

  1. Institute of Atmospheric and Environmental Science, School of Geosciences, University of Edinburgh, Edinburgh EH9 3JN, UK

Your correspondent Geoffrey Hammond is being somewhat pedantic in calling for the 'carbon footprint' — amounts of carbon expressed in tonnes — to be called instead the 'carbon weight', because the essential property of a footprint is its area ("Time to give due weight to the 'carbon footprint' issue" Nature 445, 256; doi:10.1038/445256b 2007).

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