billiard balls needed ivory. a $10,000 prize for a substitute produced celluloid in 1869, the first plastic. plastic was invented to save elephants. it now weighs about twice as much as every animal on earth combined.
method Meikle 1995 (celluloid); Elhacham et al. 2020 (anthropogenic mass vs biomass); Geyer et al. 2017; CITES MIKE for poaching.
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