Better explicating the strengths and shortcomings of these models will help refine projections and improve transparency in the years ahead.
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Edited by Leslie Lars Iversen, University of Oxford, Oxford, United Kingdom, and approved August 19, 2011 (received for review April 19, 2011)
Edited by Leslie Lars Iversen, University of Oxford, Oxford, United Kingdom, and approved August 19, 2011 (received for review April 19, 2011)
Author contributions: A.M.L. and R.O.M. designed research; A.M.L. performed research; A.M.L. and R.O.M. analyzed data; and A.M.L. and R.O.M. wrote the paper.
The authors declare no conflict of interest.
This article is a PNAS Direct Submission.
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