We explore whether the actions of one regulator can affect the efficacy of another regulator. We investigate this idea in the context of environmental enforcement, which is a primary mechanism to combat industrial pollution and climate change. Specifically, we examine whether bank regulatory oversight affects the ability of environmental enforcement to reduce industrial emissions. We predict that bank regulatory oversight can constrain the availability of bank loans, hindering firms' ability to obtain financing for greener technologies and thus mitigating the efficacy of environmental enforcement.

We study commitments to reduce emissions by firms subject to the European Union Emission Trading System (EU ETS), the world's largest cap-and-trade program. Commitments are associated with a drop in the number of carbon allowances surrendered, consistent with firms taking actions to reduce their emissions. However, firms subsequently increase their sales of allowances on the secondary market, transferring the right to pollute to others and potentially leaving aggregate emissions unchanged.

This study examines the spillover effect of environmental enforcement through private lending networks. Financial lending institutions face growing public and regulatory pressures to manage and reduce environmental risks relating to their lending activities and therefore are motivated to monitor corporate borrowers’ environmental practices.