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And when they need to travel longer distances, Americans tend to fly. The US was responsible for about a quarter of global passenger aviation emissions in 2019. Travelling by plane is estimated to result in seven times the carbon emissions of high-speed rail. While more than 20 countries now have high-speed trains zooming people to their destinations at more than 200 miles per hour, the US has yet to complete a single true high-speed rail line.

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