Nature Magazine, VOL 510: 465, August 6, 2014
by Wendy J. Palen, Thomas D. Sisk, Maureen E. Ryan, Joseph L. Árvai, Mark Jaccard, Anne K. Salomon, Thomas Homer-Dixon and Ken P. Lertzman

As scientists spanning diverse disciplines, we urge North American leaders to take a step back: no new oil-sands projects should move forward unless developments are consistent with national and international commitments to reducing carbon pollution. Anything less demonstrates flawed policies and failed leadership.

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Top Photo: Michael S. Williamson / The Washington Post via Getty