Normative theories of democracy agree that public demand should be the main guide in policymaking. But positive theories and related empirical research disagree about the extent to which this holds true in reality. We address this debate with an empirical focus on climate change policy. Specifically, we are interested in whether observable variation in public demand for climate change mitigation can help explain variation in adopted national climate policies. Using our own data to approximate public demand, we estimate the responsiveness of policymakers to changes in public demand in six OECD countries from 1995 to 2010. We find that policymakers are responsive and react in predicted ways to variation in our opinion component of measured public demand, rather than to the mere salience of the climate issue. The effect of issue salience is strongest in combination with our opinion measure as this creates a scope for action. The results underscore the importance and usefulness of our concept and empirical measures for public demand, as well as of our disaggregated analysis of climate policy outputs in this area.

Explanatory models accounting for variation in policy choices by democratic governments usually include a demand (by the public) and a supply (by the government) component, whereas the latter component is usually better developed from a measurement viewpoint. The main reason is that public opinion surveys, the standard approach to measuring public demand, are expensive, difficult to implement simultaneously for different countries for purposes of crossnational comparison and impossible to implement ex post for purposes of longitudinal analysis if survey data for past time periods are lacking. We therefore propose a new approach to measuring public demand, focussing on political claims made by nongovernmental actors and expressed in the news. To demonstrate the feasibility and usefulness of our measure of published opinion, we focus on climate policy in the time period between 1995 and 2010. When comparing the new measure of published opinion with the best available public opinion survey and internet search data, it turns out that our data can serve as a meaningful proxy for public demand.