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Climate-accountable planning - An inventory of state approaches to clean and resilient transportation -
Brookings
2025.02.07
Beginning in 2021 with the Infrastructure Investment and Jobs Act (IIJA) and then augmented by the 2022 Inflation Reduction Act (IRA), the U.S. Congress adopted a more holistic and well-funded commitment to clean and resilient transportation. Central to that congressional commitment was a direct investment in the capacity of U.S. states to conduct climate-focused transportation planning and construct related projects. Put plainly, federal law induced and supported state action.

Now, with a Republican trifecta in power in the federal government, those climate commitments are already under threat from a presidential executive order. What felt like a historic shift could be short-lived. As a result, stakeholders quickly need to understand exactly how the two new laws impact state transportation planning―and how states may respond if federal funding is discontinued. To answer both questions, we inventoried every state’s climate-focused transportation planning practices.

The results are both promising and concerning. Aided by direct federal support, more states are now producing emissions mitigation and climate resilience plans. However, the historic record also suggests roughly half of these states may revert to less climate-focused planning if federal support recedes. The record is especially worrisome in the Southeastern and Great Plains states.

Based on these findings, we believe Congress should continue to support climate-focused transportation programming. The planning laws worked; now is the time to fund states to follow-through on those plans. At the same time, states should not rely solely on federal support. Beyond continuing to plan and invest on their own, states would be wise to create a rainy-day capital account that could insure against any reductions in federal fiscal support. And with so much money being invested, states should find more ways to solicit public input on future transportation investments.