Neutral and negative effects of policy bundling on support for decarbonization

Decarbonization policies are frequently combined with other policies to increase public support or address related societal issues. To investigate the consequences of policy bundling, we conducted a survey experiment with 2,521 U.S. adults. We examined the effects of bundling decarbonization with policies favored by liberals (social justice and economic redistribution), broad bipartisan coalitions (infrastructure), and conservatives (pausing EPA regulations) on public support and polarization. Bundling with pausing EPA regulations decreased support and polarization by reducing liberal supportwithout significantly increasing conservative support. Bundling with social justice decreased support while increasing polarization by reducing conservative support without significantly increasing liberal support. Bundling with economic redistribution and infrastructure did not significantly change support or polarization. Policy bundling thus risks decreasing public support for decarbonization policies by alienating one ideological side of the electorate without gaining support from the other side. This risk exists even when policy bundling reduces polarization.