Eating meat is, unfortunately, a terribly unsustainable way to get sustenance. Livestock are responsible for huge amounts of carbon and other greenhouse gas emissions, they are relatively inefficient at converting food into body mass, and they use a huge amount of water and electricity to keep. Recent research suggests that if we continue our current meat-eating trends, carbon emissions may rise by up to 80%, a terrifying prospect! There are more eco-friendly alternatives, of course; I recently wrote on the topic of eating insects as a solution to global food security, and others have been 3D printing food. But one way or another, we must start eating fewer vertebrates.