From the NY Times: Dismantling Climate Rules Isn’t So Easy.  An excerpt:

Regulatory reversals lacking a legal or factual basis would result in lawsuits by citizens, states and industries supporting the regulations. Challengers would argue that the rules are rooted in statutory language, court precedents and in careful documentation of environmental, technological and market facts. On the climate, for example, three Supreme Court decisions established that federal climate action is required by the Clean Air Act’s broad language; and the E.P.A. then, via another rule upheld by the judiciary, documented substantial climate risks.