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I've been thinking about a lot of stuff lately. Literally. Humans are currently using over 1,100 gigatonnes of stuff, which exceeds the mass of all living creatures on Earth. Also, since the dawn of agriculture we have roughly halved the mass of life on Earth, mainly by killing trees.

Animals count for only about 0.5% of all biomass, and mammals only about 0.4% of all animal biomass. Wild mammal biomass has probably declined by something like 85% since the late Pleistocene. Now over 90% of mammal biomass is livestock!

https://www.visualcapitalist.com/all-the-biomass-of-earth-in-one-graphic/
https://refubium.fu-berlin.de/handle/fub188/32375