France bans domestic flights that can be made by train in under 2 1/2 hours to cut greenhouse gas emissions. CNN's John Vause discusses the move with Jeffrey Sachs, director of Columbia University's Center for Sustainable Development.

Watch the interview here:

https://www.cnn.com/videos/world/2023/05/24/exp-france-green-travel-restrictions-jeffrey-sachs-interview-05241aseg1-cnni-world.cnn