In Brevia

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Science  01 Nov 2002:
Vol. 298, Issue 5595, pp. 919a
DOI: 10.1126/science.298.5595.919a

A new assessment of the number of plant species threatened by human activity, by Pitman et al. (p. 989), indicates that at least 30% of all plant species are at risk of extinction this century.

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