Chinese scientists have developed a cost-effective method of converting coal into protein, which they say could feed livestock much more efficiently than natural plants, while using a tiny fraction of the land. According to Our World in Data, grazing land for livestock and farming land for animal feed production combine to take up an astonishing 40 million square kilometers (15.4 million square miles) of land. That's well over a quarter of the Earth's entire dry land area, and nearly 40% of the land defined as "habitable." This is one of the reasons the meat-heavy Western diet is under fire as...