CIS Explaining Green Innovation Ten Years after Porter’s Win-Win Proposition: How to Study the Effects of Regulation on Corporate Environmental Innovation? by Tomas Bernauer, Stéphanie Engels, Daniel Kammerer and Jazmin Seijas ETH Zurich Universität Zürich Published by the Center for Comparative and International Studies (ETH Zurich and University of Zurich) Working Paper No 17, 2006