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As I told NBC News:

“If we’re serious about reducing greenhouse-gas emissions, we have to be serious about reducing transportation emissions, and in order to do that we have to address the main source of those emissions, which come from cars and trucks on highways."

“And to that extent, we need to rethink how much we want to expand highways.”

https://www.nbcnews.com/science/environment/countries-spurn-cars-us-continues-embrace-highways-rcna145681