If we can only preserve some of the Earth9s land, how do we decide which bits to save to achieve preservation of the most species? Two reports in this issue of Science ( Ando et al. and van Jaarsveld et al.) and a policy commentary on conservation biology by SoulA© and Sanjayan address this question by presenting new computational methods. In their commentary, Pimm and Lawton discuss the use of these algorithms for making conservation choices.
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Pimm et al. (1998) studied this question.