Humanity has an insatiable hunger for meat. We’re emptying the oceans, turning the rainforest into ranches, and raising animals factory-style to satisfy our appetites. Is there a humane, eco-friendly way to get our protein fix? Along with insect farming and vegetarian substitutes, in vitro meat is a promising solution to the protein crisis. Though still expensive and difficult to produce, lab-grown muscle tissue might one day be a cheap, low-impact way of producing enough meat to feed the world.