With nearly 144 billion pounds (72 million tons) of beef and buffalo meat eaten worldwide in 2018, per The World Counts, it’s clear the need for cows is vital for the global food supply chain — and that moving away from meat would provide huge environmental benefits. The number of cows in the world is high because of demand for meat and dairy, rather than what cow populations would be without human intervention. Gates is an investor in several plant-based food companies, and he said on his podcast that his primary reason for doing so was to come up with...