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Driving this 15,000 miles a year would release about 12.2 metric tons of CO2 annually. That's equivalent to a couple going on a single roundtrip flight from California to Europe: https://flightfree.org/flight-emissions-calculator.

Judging by my Facebook, I know a lot of sociopathic assholes. :-/

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Not sure the numbers on this site add up. Passenger flights are up to around 8 passenger miles per kg CO2 (https://en.wikipedia.org/wiki/Fuel_economy_in_aircraft#/medi...).

At these rates and a great circle distance of ~8000km you'd get 4 metric tons for two people round trip. Long-haul planes are likely more efficient than average per passenger mile, so some SFO-LHR round-trips are actually closer to 1 metric ton per person. Still not great, of course.

The numbers on the site are adjusted to account for the much higher warming potential of releasing CO2 into the upper atmosphere.

According to that calculator SFO - LGW: > Round-trip emissions per passenger: 3.1 metric tons CO2

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