“…On the one hand, left-leaning executives in democracies tend to be generally more environmental-friendly than their right-wing and center counterparts, which implies that they probably favor designs that are more conducive to effective institutions. Soft-law elements can be effective under some circumstances when, e.g., they allow for greater flexibility (e.g., Skjaerseth et al, 2006;Pickering et al, 2019;Wanner, 2021), but it is generally hard law and more legalized treaties that are seen as facilitators of effective problem-solving institutions (see Wettestad, 1999;Koremenos et al, 2001;Mitchell, 2006;Young & Stokke, 2020;Miles et al, 2001;Böhmelt & Pilster, 2010;Young, 2011;Böhmelt & Butkutė, 2018;Böhmelt & Spilker, 2016). On the other hand, leftist democratic governments are usually less concerned about sovereignty costs.…”