Here are the climate-related sections of speeches by MPs during the Commons debate High Speed Rail (Government Policy).
11:00 Mr. Eric Martlew (Carlisle) (Lab)
I also do not want to go down the road of considering whether high speed rail will be beneficial in terms of carbon dioxide emissions. I think that we will get people coming out of cars and on to the train, but we must also remember that the faster a train goes the more energy that it will use. So I think that those benefits of HS2 will probably be about carbon-neutral overall.
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