externalities

miraculous machines make steak from grass
a clever trick for a dumb herbivore
but if you would account for all the mass

you've also got to tally CH4

like kangaroos, cows spew out greenhouse gas
a peril to our ice-caps and earth's fate
but what--DownUnder--comes out a 'roo's ass
our ungulates prefer to eructate
mean symbiote conveys no benefit
the cow gives room and board but gets no gain
what's not absorbed would all be passed as shit
except Archaea vent clouds of methane
sea-levels rise and corals bleach from heat
because--in part--we're eating too much meat