I know that air travel accounts for 11% of carbon emissions.
From 2nd link:
“Modern aircraft achieve fuel efficiencies of 3.5 litres per 100 passenger-km or 67 passenger-mile per US gallon. The next generation of aircraft (A380 & B787) target less than 3 litres per 100 passenger-km or 78 passenger-mile per US gallon, which exceeds the efficiency of any modern compact car on the market.”
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