NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Environmental and Energy Economics


This program studies all aspects of the energy sector and the environment, focusing particularly on their interdependence. Topics include non-energy environmental and natural resource issues, but particular attention is paid to policies that affect all sources of energy, due to that sector's role in national security and as a primary emitter of local, regional, and global pollutants.

Don Fullerton, Program Director *


[The following Program Report, the most recent on this program, appeared in the 2010 Number 4 issue of the NBER Reporter.]

The NBER's Program on Environmental and Energy Economics (EEE) was initiated in 2007, but has grown to 80 members and 240 NBER Working Papers in less than three years. The Program's research is broad and diverse. Program members study topics as varied as pollution abatement technology, the role of "pollution havens," regulated electricity markets, pollution-tax incidence, and the effects of environmental policy on employment, morbidity, and mortality. Because this body of research is too broad and too diverse to summarize in one Program Report, I will touch on only a few topics here.

Gasoline Use and Vehicle Emissions

Numerous federal policies are directed at the reduction of gasoline consumption, with the aim being to improve environmental quality and to reduce oil imports. Recent research covers a range of such policies, including gasoline taxes, fuel-efficiency regulation, and alternative fuel subsidies. The current federal tax is 18.4 cents/gallon, with state taxes adding about 30 cents more. Changes to the tax at the state level are frequent, as are proposals to alter the federal tax. The sharp gasoline price increases experienced through 2008 offer a valuable source of variation for examining the influence of gasoline price on the vehicle fleet.

Meghan Busse, Christopher Knittel, and Florian Zettelmeyer use this price variation to examine changes in the price and composition of cars purchased.1 They find that each $1 increase in the gas price causes more than a 20 percent change in new car sales at the high and low end of fuel efficiency, and changes the resale price for used cars by as much as $3000. Shanjun Li, Roger von Haefen, and Christopher Timmins investigate the effect on the fleet as a whole, showing that each 10 percent increase from the $2.34 per gallon price in 2005 generated improvements in fuel economy that were only 0.22 percent in the short run and 2 percent in the long run. 2

Politically, direct mandates have proven more successful in achieving their goals than gasoline taxes. Still, recent increases in required fuel efficiency of about 30 percent by 2016 raise questions about technological feasibility. However, Knittel draws from a long time-series of vehicle characteristics, estimating shifts in the technological frontier of fuel economy, weight, and power,3 and finds that if technological progress since 1980 had been put toward fuel economy rather than weight and power, it could have reduced fuel use by 50 percent. Meeting the strict new rules may require little more than halting the observed increases in weight and horsepower, he concludes.

Lawrence Goulder, Mark Jacobsen, and Arthur van Benthem examine ambitious new state-level mandates on fuel economy.5 Fourteen states have agreed to improve fuel economy by about 45 percent for the 2020 model year, expecting large savings in gasoline use within their borders. Yet 65 to 75 percent of these savings may be offset in the rest of the country. Federal rules are applied nationwide, so more fuel economy in some states means that less is required elsewhere. This issue of overlapping jurisdictions also applies to low carbon fuel standards and to proposals for greenhouse gas reductions.

Some policies and proposals would encourage alternative fuels such as ethanol through subsidies, mandates, and standards. Stephen Holland, Knittel, and Jonathan Hughes examine the low carbon-fuel standard, a mandate on the average ethanol content of fuels in California.6 That standard implicitly taxes conventional fossil fuel and subsidizes ethanol; yet the impact of the subsidy component can outweigh the tax and result in more overall emissions of carbon dioxide. Other policies to encourage ethanol production avoid this effect.

Mandated increases in ethanol production from corn also create pressure on world food supplies. Michael Roberts and Wolfram Schlenker calculate that mandated ethanol production in the United States will consume 5 percent of world caloric production from corn, wheat, rice, and soybeans. They show that U.S. mandates alone could increase world food prices by 20 to 30 percent.

Each of these policies would alter miles driven and change the vehicle fleet, in turn influencing traffic congestion and trade patterns. Lucas Davis and Matthew Kahn study the trade in used vehicles to Mexico, showing that 2.5 million used vehicles were exported in the four years following the North American Free Trade Agreement. 7 Policies that influence the future of the U.S. vehicle fleet therefore can be expected to affect the Mexican fleet, altering gasoline use in both countries.

Energy Markets

Heightened concerns about climate change have fuelled interest in making energy production and consumption more efficient and less carbon intensive. Leading climate policy proposals would price the externality, so that the cost of energy includes all social costs, but this approach presumes that current energy prices paid by consumers already reflect private supply costs. However, Lucas Davis and Eric Muehlegger document significant departures from marginal cost pricing in domestic natural gas markets. 8 They estimate that residential and commercial gas customers face an average markup of more than 40 percent over the period 1991-2007.

A paper by Steven Davis, Cheryl Grim, John Haltiwanger, and Mary Streitwieser studies the electricity prices paid by U.S. manufacturing plants from 1963 to 2000.9 They document tremendous dispersion in electricity prices paid by manufacturers and they find that marginal supply costs exceed marginal prices for smaller manufacturing customers by 10 percent or more.

The energy sector also is affected by market failures associated with technology innovation and diffusion. Policies that aim to accelerate the development and adoption of clean energy technologies have become an important component of environmental policy more broadly. Gilbert Metcalf analyzes the impacts of incentives for energy investment offered under the Federal tax code.10 He concludes that the Federal production tax credit has played an important role in increasing investment in wind energy development over the past decade.

Asking a slightly different question, David Popp and Richard Newell posit that new investment in the development of climate change mitigation technologies comes at the expense of other investment. 11 Linking patent data and financial data by firm, they ask whether increases in alternative energy R and D are likely to represent new R and D spending, or how much of the additional climate change R and D comes at the expense of other types of patenting activity. Although they find evidence of crowding out for alternative energy firms, they also find that alternative energy patents are cited more frequently, and by a wider range of other technologies, than other patents by these firms, suggesting that their social value is higher.

In addition to environmental externalities and the imperfect appropriability of the returns to R and D, sub-optimal investment in energy efficiency and conservation may be the result of a series of market barriers, market failures, and cognitive failures. These distortions help to rationalize more prescriptive policy interventions, including appliance standards and building energy efficiency codes. EEE Program Members evaluate the impacts of these programs and test some of their underlying assumptions. Using detailed micro data from California, for example, Dora Costa and Matthew Kahn show that the phase-in of building codes in 1983 has effectively reduced residential electricity consumption.12 Jacobsen and Kotchen analyze the impacts of a more recent building code change in Florida. 13 Using household-level billing data from Gainesville, they conclude that the increased stringency of the energy code is associated with a statistically and economically significant reduction in both electricity and natural gas consumption.

Economic Effects of Environmental Policy

Environmental and energy policy can affect employment, productivity, and growth, as well as emissions and overall economic welfare. Alternative policies differ in terms of these effects, and therefore deserve study. These policies certainly affect the price and availability of natural resources, including fisheries,14 land,15 water,16 and petroleum.17

Policies for environmental protection may affect the benefit or value of ecosystem services. Jared Carbone and Kerry Smith investigate how willingness to pay for such services depends on changes in demand for complementary market goods, where these demands can change with pollution regulations. 18 As a result, partial equilibrium estimates differ from general equilibrium calculations.Arik Levinson matches survey happiness data with EPA air quality data to infer the dollar value of air quality. 19 A major economic impact of environmental policies is their overall cost. Because air quality varies through the course of the year, Maureen Cropper and her co-authors demonstrate that costs can be reduced by limiting driving more on high-ozone days, for example by selling fewer permits to drive on those days.20 Meredith Fowlie, Knittel, and Catherine Wolfram find higher marginal abatement costs for stationary sources than for mobile sources, indicating further cost reductions from reallocation of abatement between those sources. 21

Environmental protection also has important effects on technology,22 trade,23 and human health. Using random variations in annual temperature, Olivier Deschenes and Michael Greenstone find that climate change could raise the annual mortality rate from 0.5 percent to 1.7 percent by the end of the twenty-first century, a modest amount that is not statistically significant, except for infants.24 Janet Currie and Reed Walker estimate health damages from congestion-related air pollution.25 They exploit changes in congestion from the introduction of electronic toll collection. As a result of the improved traffic flow, they find that mothers living within two kilometers of toll stations experience more than a 10 percent reduction in the incidence of low birth weight.

The EEE group also studies the distribution of the costs of environmental policy. Some researchers use partial equilibrium or input-output models to calculate the effects of increased energy costs on output prices, finding regressive effects.26 Others use computable general equilibrium (CGE) models to find effects on factor prices as well as output prices.27 Still others use analytical general equilibrium models with few sectors to solve for expressions that show how parameters affect output prices and factor prices28 and other researchers investigate redistributions between generations,29 between locations,30 or between ethnic groups. 31

Absent coordinated and harmonized global climate change policy, emissions regulation imposed in one jurisdiction may lead to increases in emissions in other jurisdictions that are less stringently regulated. Meredith Fowlie analyzes the potential for this emissions "leakage" from California's electricity sector under a source-based cap-and-trade program. Regulation that exempts out-of-state producers achieves approximately one third of the emissions reductions achieved under complete regulation, at more than twice the cost per ton of emissions abated.

James Bushnell and Yihsu Chen develop a regional model of the power sector in the western United States.32 They examine the impacts of alternative cap-and-trade designs on operations, emissions, and electricity prices. Even when the scope of the cap-and-trade program is expanded to include seven western states, they find, emissions leakage in the electricity sector could still be significant. They provide evidence to suggest that emissions leakage could be mitigated significantly by making permit allocations contingent upon past electricity production choices.

Finally, environmental and energy policy may be able to reduce uncertainty. Martin Weitzman first noted the importance of a "fat-tail" probability distribution for damages, such that a climate catastrophe might have low probability but also very high damages that outweigh the effects of discounting.33 The importance of the possible catastrophe then depends on risk aversion in utility. Constant relative risk aversion means that marginal utility is unbounded, and society would pay huge amounts to avoid a major catastrophe. Robert Pindyck finds that once marginal utility is bounded, extreme results disappear, and a thin-tailed distribution can yield higher willingness to pay for abatement.34

The Design and Implementation of U.S. Climate Policy

Although academic environmental economists like to discuss major conceptual issues in the choice between pollution taxes, permit systems, or command and control mandates,35 the U.S. House of Representatives in June of 2009 passed actual climate policy legislation. The choices are no longer just conceptual, but involve many small aspects of policy design that collectively determine the effectiveness of the policy. For this reason, Catherine Wolfram and I organized an NBER conference in Washington DC in May 2010, which focused on the actual problem of policymakers trying to design climate legislation.

In their paper for the conference, Lawrence Goulder and Robert Stavins show how federal policy interacts with state and local policy to control greenhouse gas (GHG) emissions. 36 For cap-and-trade legislation, a regional policy reduces pressure on federal constraints and allows polluters in other regions to increase emissions.

With a carbon tax, however, a particular region can have a stricter policy without that leakage. Kahn points out that cities have policies affecting carbon emissions, too.37 Zoning rules may encourage urban density, for example, which can reduce commuting, residential unit sizes, and thus energy use.

Lucas Davis points out that the House Bill also tightens energy efficiency standards for consumer appliances.38 Such standards are not necessary if higher energy prices encourage energy-efficient appliances, but they may help if landlords buy cheap inefficient appliances because renters pay electric bills. Controlling for household income and characteristics using household-level data, Davis finds that renters are significantly less likely to have efficient appliances.

Kotchen studies the effects of voluntary programs on "green electricity" adoption.39 Knittel and Ryan Sandler analyze the effects of carbon pricing on GHG emissions from the transportation sector; they find large effects of gasoline prices on consumer choices both about vehicle miles travelled and about when to scrap older vehicles.40 Other papers prepared for the conference analyze distributional effects,41 interactions of climate policy with other regulations,42 and issues of monitoring and enforcement.43

Continuing with the details of cap-and-trade policy, Meredith Fowlie looks at whether eligibility for output-based allocation of permits might be based on energy intensity and import penetration in a way that would mitigate adverse impacts on international competitiveness. 44 Roberton Williams analyzes the time-profile of climate policies, finding efficiency reasons for phase-in of a permit policy but not for a carbon tax. 45 Erin Mansur looks at reasons to implement climate policy downstream (on emissions) rather than upstream (on the carbon content of coal, natural gas, and petroleum).46

Climate policy is likely to have other effects as well. Stephen Holland shows how carbon emission restrictions might have output effects that reduce other pollutants, or substitution effects that increase other pollutants.47 Olivier Deschenes notes that higher industrial energy costs may affect labor demand; he uses 30 years of data to estimate a cross-price elasticity of -0.15 to -0.08, implying that the proposed bill's 3 percent increase in electricity prices might result in 0.3 percent less employment in the short run.48 Charles Kolstad looks at incentives for R and D, showing that a permit system can allow the innovator to capture the gains from innovation, while a tax system might not.49

The design of climate policy also must account for international considerations. Kala Krishna uses a general equilibrium model to draw analogies between emission permit restrictions and quotas or other trade restrictions, with effects on output prices, factor prices, and traded quantities.50 Besides the effects on traded goods, climate policy might create trade in "offsets", with problems that are analyzed by James Bushnell. 51 More broadly looking at all natural-carbon cycles, Severin Borenstein notes that many types of human activities could have indirect as well as direct effects on climate, in ways that might be very difficult to regulate.52

V. Kerry Smith suggests that besides introducing carbon pricing, climate policy might provide incentives for adaptation.53 Changes in climate will affect the demand for substitutes, for example when variations between normal and dry periods change the residential demand for water.

Finally, Michael Roberts and Wolfram Schlenker look at the effects of climate change on agricultural output.54 While average yields have risen over past decades, crop tolerance to extreme heat has not. Unfortunately, climate change may significantly reduce yields under current technologies.


1. M. R. Busse, C. R. Knittel, and F. Zettelmeyer, "Pain at the Pump: The Differential Effect of Gasoline Prices on New and Used Automobile Markets," NBER Working Paper No. 15590, December 2009.

2. S. Li, R. von Haefen, and C. Timmins, "How Do Gasoline Prices Affect Fleet Fuel Economy?" NBER Working Paper No. 14450, October 2008, and American Economic Journal: Economic Policy, 1(2), August 2009, pp. 113-37.

3. C. R. Knittel, "Automobiles on Steroids: Product Attribute Trade-Offs and Technological Progress in the Automobile Sector," NBER Working Paper No. 15162, July 2009, and forthcoming in the American Economic Review.

4. L. Goulder, M. Jacobsen, and A. van Benthem "Unintended Consequences from Nested State & Federal Regulations: The Case of the Pavley Greenhouse-Gas-per-Mile Limits," NBER Working Paper No. 15337, September 2009.

5. S. Holland, C. Knittel, and J. Hughes, "Greenhouse Gas Reductions under Low Carbon Fuel Standards?" NBER Working Paper No. 13266, July 2007, and American Economic Journal: Economic Policy, 1(1), February 2009, pp. 106-46.

6. M. Roberts and W. Schlenker, "Identifying Supply and Demand Elasticities of Agricultural Commodities: Implications for the US Ethanol Mandate," NBER Working Paper No. 15921, April 2010.

7. L. Davis and M. Kahn, "International Trade in Used Durable Goods: The Environmental Consequences of NAFTA," NBER Working Paper No. 14565, December 2008, and forthcoming in the American Economic Journal: Economic Policy.

8. L. W. Davis and E. Muehlegger, "Do Americans Consume Too Little Natural Gas? An Empirical Test of Marginal Cost Pricing", NBER Working Paper No. 15885, April 2010, forthcoming in the RAND Journal of Economics.

9. S. J. Davis, C. Grim, J. Haltiwanger, and M. Streitwieser, "Electricity Pricing to U.S. Manufacturing Plants, 1963-2000", NBER Working Paper No. 13778, February 2008.

10. G. E. Metcalf, "Investment in Energy Infrastructure and the Tax Code", NBER Working Paper No. 15429, October 2009, and Tax Policy and the Economy 24, 2010, pp. 1-33.

11. D. Popp and R. G. Newell, "Where Does Energy R&D Come From? Examining Crowding Out from Environmentally-Friendly R&D", NBER Working Paper No. 15423, October 2009.

12. D. L. Costa and M. E. Kahn, "Why Has California's Residential Electricity Consumption Been So Flat since the 1980s?: A Microeconometric Approach", NBER Working Paper No. 15978, May 2010.

13. G. D. Jacobsen and M. J. Kotchen, "Are Building Codes Effective at Saving Energy? Evidence from Residential Billing Data in Florida", NBER Working Paper No. 16194, July 2010.

14. R. T. Deacon, D. P. Parker, and C. Costello, "Overcoming the Common Pool Problem through Voluntary Cooperation: The Rise and Fall of a Fishery Cooperative", NBER Working Paper No. 16339, September 2010.

15. H. Sigman, "Environmental Liability and Redevelopment of Old Industrial Land", NBER Working Paper No. 15017, May 2009, and Journal of Law and Economics, 53, May 2010, pp. 289-306.

16. S. Olmstead, W. M. Hanemann, and R. N. Stavins, "Water Demand under Alternative Price Structures", NBER Working Paper No. 13573, November 2007, and Journal of Environmental Economics and Management, 54, 2007, pp. 181-98.

17. J. D. Hamilton, "Causes and Consequences of the Oil Shock of 2007-8", NBER Working Paper No. 15002, May 2009, and "Understanding Crude Oil Prices", NBER Working Paper No. 14492, November 2008, and The Energy Journal, 30(2), 2009, pp. 179-206.

18. J. C. Carbon and V. K. Smith, "Valuing Ecosystem Services in General Equilibrium", NBER Working Paper No. 15844, March 2010.

19. A. Levinson, "Valuing Public Goods Using Happiness Data: The Case of Air Quality", NBER Working Paper No. 15156, July 2009.

20. M. L. Cropper, Y. Jiang, A. Alberini, and P. Baur, "Getting Cars off the Road: The Cost-Effectiveness of an Episodic Pollution Control Program", NBER Working Paper No. 15904, April 2010.

21. M. Fowlie, C. R. Knittel, and C. Wolfram, "Sacred Cars? Optimal Regulation of Stationary and Non-stationary Pollution Sources", NBER Working Paper No. 14504, November 2008.

22. W. D. Nordhaus, "The Perils of the Learning Model For Modeling Endogenous Technological Change", NBER Working Paper No. 14638, January 2009.

23. A. Levinson, "Technology, International Trade, and Pollution from U.S. Manufacturing", NBER Working Paper No. 13616, November 2007, and American Economic Review, 99(5), December 2009, pp. 2177-92.

24. O. Deschenes and M. Greenstone, "Climate Change, Mortality, and Adaptation: Evidence from Annual Fluctuations in Weather in the US", NBER Working Paper No. 13178, June 2007.

25. J. Currie and R. Walker, "Traffic Congestion and Infant Health: Evidence from E-ZPass," NBER Working Paper No. 15413, October 2009, and forthcoming in the American Economic Journal: Applied Economics.

26. Three examples include: S. Borenstein, "The Redistributional Impact of Non-linear Electricity Pricing", NBER Working Paper No. 15822, March 2010; K. A. Hassett, A. Mathur, and G. E. Metcalf, "The Incidence of a U.S. Carbon Tax: A Lifetime and Regional Analysis", NBER Working Paper No. 13554, October 2007, and The Energy Journal, 30(2), pp. 155-178; and C. A. Grainger and C. D. Kolstad, "Who Pays a Price on Carbon?", NBER Working Paper No. 15239, August 2009 and Environmental & Resource Economics, 46(3), July 2010, pp. 359-76.

27. S. Rausch, G. E. Metcalf, J. M. Reilly, and S. Paltsev, "Distributional Implications of Alternative U.S. Greenhouse Gas Control Measures", NBER Working Paper No. 16053, June 2010, and The B.E. Journal of Economic Analysis & Policy, 10(2).

28. D. Fullerton and G. Heutel, "Analytical General Equilibrium Effects of Energy Policy on Output and Factor Prices," NBER Working Paper No. 15788, February 2010, and The B.E. Journal of Economic Analysis & Policy, 10(2). See also D. Fullerton and H. Monti, "Can Pollution Tax Rebates Protect Low-Income Families? The Effects of Relative Wage Rates", NBER Working Paper No. 15935, April 2010.

29. L. H. Summers and R. J. Zeckhauser, "Policymaking for Posterity," NBER Working Paper No. 14359, September 2008, and Journal of Risk and Uncertainty, 37(2), pp. 115-40.

30. N. V. Kuminoff, V. K. Smith, and C. Timmins, "The New Economics of Equilibrium Sorting and its Transformational Role for Policy Evaluation", NBER Working Paper No. 16349, September 2010.

31. H. S. Banzhaf and R. P. Walsh, "Segregation and Tiebout Sorting: Investigating the Link between Investments in Public Goods and Neighborhood Tipping", NBER Working Paper No. 16057, June 2010.

32. J. B. Bushnell and Y. Chen, "Regulation, Allocation, and Leakage in Cap-and-Trade Markets for CO2", NBER Working Paper No. 15495, November 2009.

33. M. L. Weitzman, "On Modeling and Interpreting the Economics of Catastrophic Climate Change," Review of Economics and Statistics, 91(1), February, 2009, pp 1-19. Also see M. L. Weitzman, "GHG Targets as Insurance against Catastrophic Climate Damages", NBER Working Paper No. 16136, June 2010.

34. R. S. Pindyck, "Fat Tails, Thin Tails, and Climate Change Policy", NBER Working Paper No. 16353, September 2010.

35. See, for example, L. Kaplow, "Taxes, Permits, and Climate Change", NBER Working Paper No. 16268, August 2010.

36. L. H. Goulder and R. Stavins, "Interactions of State and Federal Climate Change Policies", NBER Working Paper No. 16123, June 2010.

37. M. E. Kahn, "Urban Policy Effects on Carbon Mitigation," NBER Working Paper No. 16131, June 2010.

38. L. W. Davis, "Evaluating the Slow Adoption of Energy Efficient Investments: Are Renters Less Likely to Have Energy Efficient Appliances?" NBER Working Paper No. 16114, June 2010.

39. M. J. Kotchen, "Climate Policy and Voluntary Initiatives: An Evaluation of the Connecticut Clean Energy Communities Program", NBER Working Paper No. 16117, June 2010.

40. C. R. Knittel and R. Sandler, "Carbon Prices and Automobile Greenhouse Gas Emissions: The Extensive and Intensive Margins", NBER Working Paper No. 16482, October 2010.

41. G. E. Metcalf, A. Mathur, and K. A. Hassett, "Distributional Impacts in a Comprehensive Climate Policy Package", NBER Working Paper No. 16101, June 2010.

42. A. Levinson, "Belts and Suspenders: Interactions among Climate Policy Regulations", NBER Working Paper No. 16109, June 2010.

43. H. Sigman, "Monitoring and Enforcement of Climate Policy", NBER Working Paper No. 16121, June 2010.

44. M. Fowlie, "Updating the Allocation of Greenhouse Gas Emissions Permits in a Federal Cap-and-Trade Program", NBER Working Paper No. 16307, August 2010.

45. R. C. Williams, "Setting the Initial Time-Profile of Climate Policy: The Economics of Environmental Policy Phase-Ins", NBER Working Paper No. 16120, June 2010.

46. E. T. Mansur, "Upstream versus Downstream Implementation of Climate Policy", NBER Working Paper No. 16116, June 2010.

47. S. P. Holland, "Spillovers from Climate Policy", NBER Working Paper No. 16158, July 2010.

48. O. Deschenes, "Climate Policy and Labor Markets", NBER Working Paper No. 16111, June 2010. Employment effects are also studied by J. Graff-Zivin and M. J. Neidell, "Temperature and the Allocation of Time: Implications for Climate Change", NBER Working Paper No. 15717, February 2010.

49. C. D. Kolstad, "Regulatory Choice with Pollution and Innovation", NBER Working Paper No. 16303, August 2010.

50. K. Krishna, "Limiting Emissions and Trade: Some Basic Ideas", NBER Working Paper No. 16147, July 2010.

51. J. B. Bushnell, "The Economics of Carbon Offsets", NBER Working Paper No. 16305, August 2010.

52. S. Borenstein, "Markets for Anthropogenic Carbon within the Larger Carbon Cycle", NBER Working Paper No. 16104, June 2010.

53. V. K. Smith, "How Can Policy Encourage Economically Sensible Climate Adaptation?" NBER Working Paper No. 16100, June 2010.

54. M. J. Roberts and W. Schlenker, "Is Agricultural Production Becoming More or Less Sensitive to Extreme Heat? Evidence from U.S. Corn and Soybean Yields", NBER Working Paper No. 16308, August 2010.







*Professor Fullerton is the Director of the NBER's Program on Environmental and Energy Economics and a Professor of Finance at the University of Illinois at Urbana-Champaign. A complete list of NBER Working Papers on Environmental and Energy Economics can be found here

 
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