In recognition of the urgency of reducing methane emissions, several voluntary international multiparty agreements and initiatives have recently been concluded to accelerate collective action and establish formal mechanisms for monitoring the implementation of methane-related commitments. While these initiatives reflect ambition on the part of public, private, and civil society actors with regard to methane, the implementation of these initiatives presents challenges for governments, emitting sectors, and other parties.

As one of the first low-carbon pioneering provinces in China, Guangdong launched its carbon market in 2013. An important design feature of the Guangdong emissions trading system (ETS) has been the use of offset credits. This brief, in both Chinese and English, explores the Guangdong ETS’s offset mechanism and its possible future evolution.

India plays a critical role in global climate and energy policy. Although India is only responsible for 7% of global greenhouse gas emissions today, it has a large population and considerable potential for rapid economic growth. This paper explores how India’s states can best address climate change, the relative roles of state and Union governments, and how relationships between states and New Delhi can constrain or accelerate climate action.

Donald Trump’s 2016 election and his nomination of climate skeptic Scott Pruitt to head the Environmental Protection Agency drastically downshifted expectations on U.S. policy toward climate change. Joseph Biden’s 2020 election shifted them dramatically upward. The authors study firms’ stock-price movements in reaction. As expected, the 2016 election boosted carbon-intensive firms. Surprisingly, firms with climate-responsible strategies also gained, especially those firms held by long-run investors. Such investors appear to have bet on a ‘‘boomerang’’ in climate policy. Harbingers of a boomerang already appeared during Trump’s term. The 2020 election marked its arrival.

The seminal contributions of William Nordhaus to scholarship on the long-run macroeconomics of global climate change are clear. Much more challenging to identify are the impacts of Nordhaus and his research on public policy in this domain. The authors examine three conceptually distinct pathways for that influence: his personal participation in the policy world; his research’s direct contribution to the formulation and evaluation of public policy; and his research’s indirect role informing public policy

After reviewing emission mitigation’s poor performance and low-probability of delivering on long-term climate goals, the authors evaluate a three-pronged strategy for mitigating climate change risks: adding adaptation and amelioration — through solar radiation management (SRM) — to the emission mitigation approach.  They conclude by assessing the value of an iterative act-learn-act policy framework that engages all three prongs for limiting climate-change damages.

This discussion paper (available in English and Chinese) describes the evolution of decentralization over the reform period that began in China in 1978, different theories of institutional change in China, and how the empirical and theoretical literatures help scholars and policymakers understand the development of institutions for governing GHG-emitting activities.

How do the two major approaches to carbon pricing compare on relevant dimensions, including efficiency, cost-effectiveness, and distributional equity? This paper addresses this question by drawing on theories of policy instrument choice pertaining to the attributes — or merits — of the instruments.

This paper evaluates factors affecting the potential to transition over time to more efficient longrun climate policies, including the sequence of policies to be adopted. By considering these factors, policymakers can increase the likelihood that more efficient policies emerge from the current suite of less-efficient measures being pursued by some national and sub-national governments. The authors focus on the state of Oregon, which is currently contemplating the adoption of a greenhouse-gas cap-and-trade system.

There is widespread agreement among economists — and a diverse set of other policy analysts — that at least in the long run, an economy-wide carbon pricing system will be an essential element of any national policy that can achieve meaningful reductions of CO2 emissions cost-effectively in the United States. There is less agreement, however, among economists and others in the policy community regarding the choice of specific carbon-pricing policy instrument.