April 08, 2024
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Flying is one of the most carbon-intensive activities — yet it contributes just 2.5% of the world’s carbon emissions. How does this add up? Well, almost everyone in the world does not fly. Studies estimate that just 10% of the world flies in most years.1 But as incomes rise, this will change.

A combination of increased demand and technological improvements has driven the change in aviation emissions over the last half-century. Total CO2 emissions are often explained through the “Kaya identity” — how many people there are, their income, the energy efficiency of economies, and the carbon intensity of energy. We can use a similar framework to understand t

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