FLYING IS A dirty business. Airliners account for more than 2% of the annual global emissions from the burning of fossil fuels, many times commercial aviation’s contribution to world GDP. Two forces look poised to push this figure up in the years to come.
First, people love to fly. IATA, the airline industry’s trade body, predicts that 4bn passengers will take to the skies next year, as many as did in 2019, before covid-19 temporarily grounded the sector. Airlines could be hauling around 10bn passengers by mid-century (see chart 1). Boeing, an American planemaker, estimates that this will require the global fleet to roughly
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