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Better for one to travel. A disproportionate amount of a flight’s fuel is in takeoff and climb. Meeting in Houston is far worse because you’ve doubled the required takeoff rolls.

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Unless it's accounting for no direct flights between Caracas and San Francisco, which would mean either the Caracas person needs to fly to SF connecting in Houston, or both go to Houston in a direct flight, meet there and go back. It's the same 4 takeoffs.

(Disclaimer, I have no idea if there are direct flights from Caracas to SF, but from Brazil I always need to stop by in a hub)

Even with a layover, it’s better for one to do it because it’s one less hotel room, airport transport, etc.

The tool claims to take that into account, it breaks it down in the "show report" button. Liftoff is 3 tons of CO2.

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