1.1 → 1 million tonnes co2e a business seat is about three times an economy seat, by space. on a long-haul return that is about 1.1 tonnes of co2e saved.
method per-person, per-year estimate from the cited study (ICAO carbon calculator; DEFRA factors), world-average where the study allows; the million-people column is straight multiplication. 'for scale' divides by 0.8 t CO2e, the meat-free yardstick.
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