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This article gives the carbon footprint of 20 billionaires. Their estimate for Gates is far too high because he doesn’t use regular jet fuel, he uses biofuel, which makes most of his carbon footprint zero.

https://theconversation.com/private-planes-mansions-and-superyachts-what-gives-billionaires-like-musk-and-abramovich-such-a-massive-carbon-footprint-152514