In the current issue of Governance, Christoffer Green-Pedersen and Michelle Wolfe contrast American and European approaches to the regulation of CO2 emissions, which contribute to global warming.  Popular explanations of the differing American and European approaches to environmental regulation often cite cultural differences, such as the US’ preference for market-based solutions.  But Green-Pedersen and Wolfe say more attention should be paid to structural differences in political systems that determine how policy agendas are established.  In the US, a more open system results in quicker attention to new issues, but a lower probability that this attention will be institutionalized.  In Denmark, by contrast, environmental policy making can be described as “a car that is difficult to start, but once started runs at a high and constant pace.”  Read more: The Institutionalization of Environmental Attention in the United States and Denmark: Multiple- Versus Single-Venue Systems.