Better explicating the strengths and shortcomings of these models will help refine projections and improve transparency in the years ahead.
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Contributed by David R. Nelson, May 1, 2012 (sent for review February 17, 2012)
Contributed by David R. Nelson, May 1, 2012 (sent for review February 17, 2012)
Author contributions: A.A. and D.R.N. designed research; A.A. and D.R.N. performed research; and A.A. and D.R.N. wrote the paper.
The authors declare no conflict of interest.
This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1207105109/-/DCSupplemental.
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