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Some basic statistics: Number of humans on Earth: ~7.3 billion people CO2 output per day per human: ~1.0 kilograms CO2 output per year by vertebrates: ~220 gigatonnes (=220 trillion kilograms) ...
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#1: Attribution notice removed
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2020-06-01T14:13:47Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/32521 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/