The Evolution of Environmental Regulation

Key Takeaways

• 2007 Supreme Court affirmed EPA authority over greenhouse gases
• EPA’s 2009 endangerment finding enabled vehicle and power‑plant rules
• Current administration rescinded finding, threatening climate regulations
• Loper Bright curtails Chevron deference; Clean Air Act likely unchanged
• Heinzerling urges statutory criteria over formal cost‑benefit analysis

Summary

In an interview with The Regulatory Review, Georgetown law professor Lisa Heinzerling examined the legal architecture shaping U.S. climate policy, from the 2007 Supreme Court ruling that affirmed the EPA’s authority to regulate greenhouse gases under the Clean Air Act to the agency’s recent rescission of its 2009 endangerment finding. She critiqued the reliance on formal cost‑benefit analysis, arguing that statutes, not monetary metrics, should drive environmental decisions. Heinzerling also addressed the implications of the 2023 Loper Bright decision, which limits Chevron deference, and how it may intersect with Clean Air Act jurisprudence. The discussion highlights a pivotal moment for federal climate regulation.

Pulse Analysis

The Clean Air Act’s 1970 framework gained unprecedented relevance after the 2007 Supreme Court decision in Massachusetts v. EPA, which recognized greenhouse gases as pollutants warranting federal oversight. That landmark ruling unlocked a cascade of regulations—from vehicle emissions standards to power‑plant limits—grounded in the agency’s 2009 endangerment finding. By establishing a scientific basis for action, the finding created a durable legal shield that has withstood decades of industry pushback, reinforcing the EPA’s role as a central climate regulator.

Heinzerling’s critique of formal cost‑benefit analysis reflects a broader scholarly debate about how environmental policies should be evaluated. She argues that many statutes explicitly prioritize health, safety, and ecological values over monetized trade‑offs, and that discounting future benefits erodes the intergenerational equity embedded in environmental law. This perspective urges policymakers to lean on statutory criteria and scientific evidence rather than abstract economic models, a shift that could streamline rulemaking and reduce litigation grounded in alleged procedural flaws.

The recent rescission of the endangerment finding, coupled with the Supreme Court’s Loper Bright decision limiting Chevron deference, signals a potential contraction of agency power. While Loper Bright may not directly overturn Clean Air Act provisions, its emphasis on textualist review could invite fresh challenges to existing climate rules. Industries poised to benefit from deregulation must weigh the risk of renewed lawsuits, whereas environmental advocates anticipate a surge in court battles to preserve the regulatory foundation established over the past two decades. The evolving legal landscape will likely dictate the pace and scope of U.S. climate action for years to come.