This abstract is adapted from Cass R. Sunstein, Arbitrariness Review and Climate Change, 170 U. Pa. L. Rev. 991 (2022), and used with permission.

In 4°C, Ruhl and Craig effectively argue that governance measures, particularly adaptation planning, will fall short if institutions fail to embrace the real possibility that the planet will blow well past 2° Celsius (°C) above pre-industrial temperatures. Further, they argue that 4°C is a better target for adaptation planning because this metric better captures the future risk the nation faces. Ruhl and Craig are keenly aware that serious talk of a possible 4°C future will almost certainly trigger accusations of “doomism” from various critics.

In 4°C, Ruhl and Craig acknowledge that the Earth’s climate is changing at an increasingly rapid rate, outside the range to which society has adapted in the past. Realistically, achieving the goal set in the 2015 Paris Agreement of limiting global warming to 1.5°C will be almost unattainable without drastic actions to reduce greenhouse gas emissions.

Accelerating ice loss and expanding wildfire zones are potential markers of what are known as tipping points—thresholds along a nonlinear pattern of system change that accelerate the pace of change. Scientists are concerned that our global climate system is dangerously close to passing these points. This trend has significant implications for governance and law. Climate change disruptions will extend beyond biophysical systems to social systems, including systems of governance.

This Article, adapted from the Climate Science and Law for Judges Curriculum, examines the status and viability of judicial remedies in climate change litigation. It focuses on climate cases that are seeking science-based remedies specifically related to climate mitigation (actions to reduce greenhouse gas emissions or draw down atmospheric carbon) and climate-change adaptation (actions to reduce the negative impacts of climate disruption on human and natural communities).

In June 2022, in West Virginia v. Environmental Protection Agency, the U.S. Supreme Court announced that on “major questions” the U.S. Congress must legislate with far more clarity and specificity than previously demanded. The Court held the U.S. Environmental Protection Agency (EPA) may regulate power plant carbon emissions in traditional ways, but the novel approach taken in the Clean Power Plan required clearer authorization than Congress had provided. Six weeks later, Congress enacted the Inflation Reduction Act (IRA).

The Inflation Reduction Act and Federal Buy Clean Initiative have each inspired states and municipalities to regulate embodied carbon (Scope 3) using “Buy Clean” policies and legislation. Reducing embodied carbon has become mainstream, and environmental product declarations (EPDs) have surfaced as the tool. Are EPDs alone enough? Is the compliance timeline sufficient? On February 1, 2023, the Environmental Law Institute hosted a panel of experts that provided an update on Buy Clean policy, green funding, the status of carbon emissions, and a primer on EPDs.

More severe storms and rising sea levels resulting from a changing climate pose a threat to ecosystems along the U.S. coast. These include beaches, dunes, wetlands, and marshes, which provide significant environmental, recreational, and economic benefits. Practices to sustain these ecosystems are available, but are not well understood, face legal and financial obstacles, and have not been widely implemented. On January 19, 2023, the Environmental Law Institute hosted a panel of experts who explored measures and practices for sustaining coastal wetlands in the face of a changing climate.

As noted by the International Energy Agency, taxation is a necessary component of strategies to increase adoption of electric vehicle (EV) technology. In the United States, taxation has supported the energy policy of increased uptake of EVs. This Article focuses on the evolving U.S. tax policy, highlighting the 2022 Inflation Reduction Act. It addresses continuing challenges and ways to meet those challenges, including examining some European policies for encouraging EVs. The author concludes by recommending policies that may be consistent with existing U.S.

Many chemicals and hazardous substances are kept in places that can withstand ordinary rain, but not severe storms or floods. If these events occur and the chemicals are released, people and the environment may be endangered. This Article discusses the hazards posed to chemical and waste disposal facilities by extreme weather events that would be worsened as a result of climate change, and how U.S. laws do (or do not) deal with these hazards; and considers how the law would need to change to cope with what would happen to these facilities in a potentially 4°C world.