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Or just not eating meat. :P

For a first world individual, highest impact is not heating/cooling or skipping on transcontinental flights. Meat production globally has a non trivial emissions output but for a first world individual, diet is maybe 10% of footprint. Without Hot Air book goes through these calculations.

Still, planting 1000 trees and making sure they exist for 40 years makes your footprint invisible.

I would imagine that most people would find it easier to not start travelling than to give up meat: but the most likely outcome is that they will do neither. Because all this will be solved by flying nuclear cars which will be the only transport used by the people that have not emigrated to Mars.

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