Add four BILLION MORE HUMANS AND NO ONE WILL HAVE ANY FOOD. #OVERPOPULATION is the scourge and #death Of life in this planet. I don’t want to live on Mars!
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Instead of telling people to "shift to plant-heavy diets", you should tell them to eat less meat. It's clearer. People already get most of their calories from plants, and adding more plants to existing diets wouldn't help biodiversity at all.
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