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The environmental Kuznets curve suggests emissions per capita increases with income, up to a point. Then emissions per capita begin to decline with further increases in income. This theory has supported and also rejected using international data for entire nations. I've not seen a study using income deciles within a nation. I guess it's hard (impossible) to measure emissions per capita in each decile.

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I wonder if it would be more of a step function. People don't continuously increase the size of their home. They have to have enough money to jump to a larger home, and then enough money to jump to having a second home or a yacht or etc. These jumps would come with jumps in CO2 increases.

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