Transportation is the largest source of greenhouse gas emissions in the United States, and there can be no long-term, successful climate action absent progress in reducing emissions from this sector. Last November, the Department of Transportation released its long-awaited Greenhouse Gas Performance Measure rule, which is a common-sense rule requiring all 50 states to measure the climate impacts of their transportation choices and set reduction targets. This rule, which received more than 100,000 letters of support, would provide greater transparency about the billions the federal government is providing states in transportation infrastructure, and it allows states the flexibility to set their own goals for reducing emissions. For better or worse, it bears repeating that there are no penalties for states that do not submit targets.
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