A study by Purdue researchers, Maksym Chepeliev and Dominique van der Mensbrugghe of the Department of Agricultural Economics, in collaboration with Israel Osorio-Rodarte from the World Bank, examined the costs of the U.S. rejoining the Paris Climate Accord and President Biden's plan calling for carbon free electricity by 2035 and net zero emissions by 2050.

The researchers compared the potential impacts of the commitments of the 195 parties that signed the Paris agreement (called the Nationally Determined Contribution, or NDC), an unchanged U.S. climate policy, and new policies announced by the Biden administration.

The analysis, U.S. Climate Policy Revisited: Macroeconomic and Distributional Impacts of the Paris Agreement, was conducted using a global computable general equilibrium model ENVISAGE, based on the Global Trade Analysis Project’s data base, and the World Bank’s GIDD microsimulation model to examine economic growth and income distributions.

“Adopting more aggressive climate mitigation policies would result in progressive income distribution, while negative macroeconomic impacts would be very limited,” Chepeliev said. “In addition, the benefits of adopting more stringent mitigation efforts would have a significant positive influence on the environment and health.”

A key study finding is the effect climate action will have on U.S. income distribution, primarily due to lower increases in food prices (1.1%) compared with the change in nonfood prices (1.8%), under an ambitious 2 degree C mitigation effort. This change will result primarily from increases in energy prices and fuel and transportation cost. However, since lower income households typically spend less on nonfood items, their cost burden will be considerably less than those in higher income households.

Implementation of the U.S. NDC, in the absence of global emissions trading, would lead to a real income reduction of only 0.17% in 2030. A more ambitious policy, consistent with limiting global warming below 2 degree C, would reduce real income by 0.55%. If the U.S. and other countries engage in cooperative climate actions that incorporate emissions trading, the corresponding real income losses are reduced substantially (0.06% and 0.27% respectively).

Climate mitigation policies would negatively impact "dirty" jobs through reductions in fossil fuel mining and fossil fuel-based electricity generation and would boost the creation of new "green” jobs in the renewable electricity generation. Under the NDC scenario (and no climate cooperation), output of coal would decrease by 23.7% in 2030, followed by fossil-fuel power generation (-21.0%), natural gas (-19.1%), crude oil (-5.0%) and petroleum products (-3.3%). Nonfossil fuel power generation would grow by 6%.

With a more ambitious 2 degree C mitigation effort, fossil fuel power generation would see its output cut in half and non-fossil fuel generation would increase around 15%, further boosting a green economy transition in the U.S.

“Compared to other high-income countries – EU, Canada, Australia and New Zealand – the cost of emissions reduction in U.S. is much lower,” Chepeliev said. “Coupled with positive distributional impacts, environmental and health co-benefits, climate mitigation is a win-win policy to implement in the upcoming years.”

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