What are the direct health implications of making clean meat—that is, meat without animals? In a 1932 article in Popular Mechanics entitled “Fifty Years Hence,” Winston Churchill predicted that we would one day “escape the absurdity of growing a whole chicken in order to eat the breast or wing, by growing these parts separately under a suitable medium.” Indeed, growing meat straight from muscle cells could reduce greenhouse gas emissions by as much as 96 percent, lower water usage by as much as 96 percent, and lower land usage by 99 percent. If we are to avoid dangerous climate change by the m...

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