We use machine learning algorithms to construct a novel news-based index of US environmental and climate policy uncertainty (EnvPU) available on a monthly basis over the 1990-2019 period. We find that our EnvPU index spikes during the environmental spending disputes of the 1995-1996 government...

History offers many examples of dictators who worsened their behavior significantly over time (like Zimbabwe's Mugabe) as well as dictators who displayed remarkable improvements (like Rawlings of Ghana). The authors show that such mutations can result from rational behavior when the dictator's...