Environment & Climate Change

Joseph Aldy describes the challenge of reforming fossil fuel subsidies, given uncertainty about how much subsidies actually cost governments and given provisions in the US tax code that privilege fossil fuels over renewable energy sources. Aldy also elaborates on some policies that the Biden administration—which has committed to removing fossil fuel subsidies—could target as policymakers develop infrastructure legislation.

China recently launched the world’s largest emissions trading market, but it is just one component of the nation’s ambitious efforts to curb the rise in greenhouse-gas emissions. That was the message delivered on Thursday (July 22) by Carnegie Mellon University Associate Professor Valerie Karplus during a Virtual Forum hosted by the Harvard Project on Climate Agreements (HPCA) and moderated by Robert Stavins, HPCA Director and A.J. Meyer Professor of Energy and Economic Development.

Guangdong Province ranks first in economic output among China’s provinces and will play a major role in achieving China’s national climate-change goals. This paper examines the progress of Guangdong Province’s carbon dioxide emissions trading system (ETS) in reducing emissions; design features of the system; challenges it faces with regard to further development; and its relationship to China’s new national ETS.

The United States and United Kingdom have longstanding traditions in use of environmental benefit-cost analysis (E-BCA). While there are similarities between how E-BCA is utilized, there are significant differences too, many of which mirror ongoing debates and recent developments in the literature on environmental and natural resource economics. We review the use of E-BCA in both countries across three themes: (a) the role of long-term discounting; (b) the estimation and use of carbon valuation; and, (c) the estimation and use of the value of a statistical life. 

In order to fully appreciate the global climate-change challenge that the Biden administration will face, Robert Stavins reflects on the history of international negotiations that brought us to this point.

This paper considers the treatment of co-benefits in benefit-cost analysis of federal air quality regulations. Using a comprehensive data set on all major Clean Air Act rules issued by the Environmental Protection Agency over the period 1997–2019, the authors show that (1) co-benefits make up a significant share of the monetized benefits; (2) among the categories of co-benefits, those associated with reductions in fine particulate matter are the most significant; and (3) co-benefits have been pivotal to the quantified net benefit calculation in nearly half of cases.

Nobel Prize–winning economist Joseph Stiglitz, University Professor at Columbia University, shared his thoughts on carbon pricing, the post-pandemic economic recovery, and green economy transition during a virtual forum on September 8 sponsored by the Harvard Project on Climate Agreements, and hosted by Robert Stavins, A.J. Meyer Professor of Energy and Economic Development at Harvard Kennedy School.

Richard Schmalensee, the Howard W. Johnson Professor of Management Emeritus and Dean Emeritus at the MIT Sloan School of Management, reflected on his many years working on environmental policy in public service and academia in the newest episode of “Environmental Insights: Discussions on Policy and Practice from the Harvard Environmental Economics Program.” 

To accelerate the global transition to a low-carbon economy, all energy systems and sectors must be actively decarbonized. While hydrogen has been a staple in the energy and chemical industries for decades, renewable hydrogen is drawing increased attention today as a versatile and sustainable energy carrier with the potential to play an important piece in the carbon-free energy puzzle. Countries around the world are piloting new projects and policies, yet adopting hydrogen at scale will require innovating along the value chains; scaling technologies while significantly reducing costs; deploying enabling infrastructure; and defining appropriate national and international policies and market structures.

What are the general principles of how renewable hydrogen may reshape the structure of global energy markets? What are the likely geopolitical consequences such changes would cause? A deeper understanding of these nascent dynamics will allow policy makers and corporate investors to better navigate the challenges and maximize the opportunities that decarbonization will bring, without falling into the inefficient behaviors of the past.

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.