NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

The Environment and Directed Technical Change

Daron Acemoglu, Philippe Aghion, Leonardo Bursztyn, David Hemous

NBER Working Paper No. 15451
Issued in October 2009

---- Acknowledgements -----

We thank Robert Barro, Emmanuel Farhi, Elhanan Helpman, David Laibson, Per Krusell, Ariel Pakes, Torsten Persson, Nicholas Stern, Nancy Stokey and Martin Weitzman for very helpful suggestions. We also benefited from the comments of seminar and conference participants at Harvard, MIT, Stanford, Berkeley, IIES in Stockholm, Zurich, the NBER Summer Institute, the Midwest macro conference, the Canadian Institute for Advanced Research, the Latin American Meeting of the Econometric Society, and Simon Fraser University. The views expressed herein are those of the author(s) and do not necessarily reflect the views of the National Bureau of Economic Research.

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