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Airlines should tell UK customers the carbon impact of flights, watchdog says
(www.theguardian.com)
Discussion of climate, how it is changing, activism around that, the politics, and the energy systems change we need in order to stabilize things.
As a starting point, the burning of fossil fuels, and to a lesser extent deforestation and release of methane are responsible for the warming in recent decades:

How much each change to the atmosphere has warmed the world:

Recommended actions to cut greenhouse gas emissions in the near future:

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I guess heavy luggage might impact emissions marginally. But do you really believe the flight is staying on the tarmac because you didn't book a seat?
To me, this comment completely contradicts the arguments in your previous comment. I'm curious to learn your actual opinion on the matter.
If I have a choice between two flights A and B, based exclusively on CO~2~ emissions, the only thing my selection changes is my body weight/luggage added to the flight. But the emissions calculation (as I understand it) is the total anticipated CO~2~ of the flight divided by the number of seats. And the bulk of those emissions come from lifting the plane itself, not the individual passengers.
The plane still flies whether or not I'm on it, though. So my choice of flight does not really impact emitted carbon.