" By 1900, European scientists recognized that unless a way was found to augment this naturally occurring nitrogen, the growth of the human population would soon grind to a very painful halt... After Nixon's 1972 trip the first major order the Chinese government placed was for thirteen massive fertilizer factories. Without them, China would have probably starved. "

― Michael Pollan , The Omnivore's Dilemma: A Natural History of Four Meals