Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
The literature suggests that democracy positively affects environmental policy stringency. Using the method of propensity score matching, we find that this result appears to be largely driven by the parliamentary democracies (as opposed to the presidential-congressional, proportional or majority systems). Moreover, it appears that presidential-congressional systems often set environmental policies not significantly different from autocracies. These are novel contributions to the literature. Copyright Springer Science+Business Media, LLC 2007