We investigate whether election of Donald Trump as the president of the United States of America (the US) and subsequent changes in environmental policies and regulations affected any of the 49 different industry sectors in the US. We analyze 19 different events during Trump’s tenure that were mainly rollbacks of previously created regulations and policies. To analyze stock market effects, an event study methodology is used to assess industry reactions. We assume that Trump loosened environmental regulations and policies to strengthen the US economy. Results show that the lax enforcement of environmental regulations and policies was not effective. Only the coal industry can be considered a beneficiary because it experienced repetitive significant positive abnormal returns, whereas other industries experienced mixed or negative reactions or discontinuous positive reactions. Our results contribute to the extant literature on the US environmental policy within the scope of industry.

我们调查唐纳德·特朗普的当选为美利坚合众国（美国）和随后的变化在环境政策法规总统是否影响任何在美国49个不同行业的。我们分析了特朗普任职期间的19个不同事件，这些事件主要是先前创建的法规和政策的回滚。为了分析股票市场的影响，使用事件研究方法来评估行业反应。我们认为特朗普放松了环境法规和政策以增强美国经济。结果表明，不严格执行环境法规和政策是无效的。只有煤炭行业可以被视为受益者，因为它经历了重复的，显着的正的异常收益，而其他行业则经历了混合或负面反应或不连续的正面反应。我们的研究结果为有关行业范围内的美国环境政策的现有文献做出了贡献。