Do Parties Matter for Environmental Policy Stringency? Exploring the Program-to-Policy Link for Environmental Issues in 28 Countries 1990–2015

Political parties are crucial in crafting effective national climate policies in democratic states. At the same time, there is a practical and academic debate of whether political parties matter for policy output. This article speaks to this debate by investigating the link between what parties say and what parties do with respect to environmental issues. More concretely, it analyzes whether there is a connection between the degree of environmentalism expressed in parties’ electoral manifestos and national environmental policy output. Theoretically, the article draws on existing research on program-to-policy linkages in general and for environmental issues specifically to argue that saliency of environmentalism in party manifestos shapes more stringent environmental policies. This argument is empirically tested by combining data on policy stringency with data on manifesto contents for 28 countries for the period 1990–2015. The findings corroborate the main hypothesis, which has implications for understanding the overall potential for political parties to structure national environmental politics. The article concludes by sketching broader implications for research on parties’ ability to shape national environmental policy across political systems, and across partisan ideologies.