In international regimes research, one of the most important questions is how effective regimes are in delivering what they were established and designed to achieve. Perhaps the most explicit and rigorous formula for measuring regime effectiveness is the so-called Oslo-Potsdam solution. This...

Strong rhetorical differences between the European Union and the United States on climate matters have been evident for almost two decades. Since the mid-2000s, such differences are becoming visible in their respective climate policies as well. We propose three explanations for differences in...