Back to the Future of Green Powered Economies
---- Acknowledgements -----
We are very grateful to seminar audiences at several universities, and would like to thank, without implicating, Bob Allen, Herb Emery, Oded Galor, Gene Grossman, Arvind Magesan and Jim Wilen for comments. The usual disclaimer applies. Excellent research assistance was provided by Jevan Cherniwchan, Nolan Derby and Rui Wan.