Dr. István Markó completely failed to mention that without plants, there is no food.
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I have a relative (rolling my eyes) who, despite being raised by conservative parents, but due to associations with liberal friends in high school (which has continued on and intensified in an artsy-fartsy college) has gone to the dark side - BernieBot, anti-gun .... and vegan. She also is a disciple of the man-made global warming cult. I’ll have to remind her (will see her at Thanksgiving) that without plants, what is she going to eat? :-)
Wonderful. Just keep reminding her that every bit of food on the table was atmospheric carbon dioxide just a few short months ago.
All biomass is converted CO2. No exceptions.