We study the potential negative externalities of mandatory environmental, social, and governance (ESG) disclosure. Our analysis exploits a unique regulatory change in China that requires a subset of firms to report their contributions to poverty alleviation—on top of reporting general ESG issues—using a difference-in-differences design. We find that treated firms significantly increase their anti-poverty spending, but also increase their pollution, after the regulatory change came into force. The negative environmental externality is more concentrated in firms that are more financially constrained, as well as firms that are facing fiercer market competition. We further show that this effect is driven by a firm’s incentive to strategically cater to politicians’ agenda in order to obtain preferential treatment. These findings suggest that mandating ESG disclosure in selected areas may induce firms to trade off different ESG goals by prioritizing more conspicuous ESG issues at the cost of trivializing other, longer-term, issues.