Despite myriad challenges, clinicians see room for progress.
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Edited by Hans Joachim Schellnhuber, Environmental Change Institute, Oxford, United Kingdom, and approved September 22, 2009 (received for review March 3, 2009)
Edited by Hans Joachim Schellnhuber, Environmental Change Institute, Oxford, United Kingdom, and approved September 22, 2009 (received for review March 3, 2009)
Author contributions: D.N. designed research, performed research, analyzed data, and wrote the paper.
The author declares no conflict of interest.
This article is a PNAS Direct Submission.
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