My favorite argument from the story:
"We have 7 billion people on the planet, and there will be 9 billion [people] by 2050," he says. "Those people need food. They need protein — and they tend to eat better as they get wealthier. And better, unfortunately, means eating more like Americans — a lot of meat. And a lot of meat means a lot of water, a lot of grain, a lot of grass. And we don't have that much room for any of it."