Loic, 21, has a ticket for a music festival in Amsterdam. A carrier offers direct flights from Lyon Saint Exupery, his closest airport. A lower airfare persuades him to fly on another carrier, with a connection in Bordeaux-on the other side of the country. By doing so, Loic is saving a few dozen euros, certainly not negligible on a student's budget-but he is simultaneously increasing his roundtrip's carbon footprint by 88%, to 0.64 metric tons.
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