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No, 600 megatons (~E12 kg) is closer. There are E10 humans and we weigh E2 kg. More precisely: 6E1 kg * 8E9 = 5.6E11

Numbers are to be considered about dehydrated mass, again according to the study.

Interesting. I didn’t read the study. I wonder if that favors smaller animals? Are large mammals a larger fraction water?