In Michael Pollan’s 2006 book, “The Omnivore’s Dilemma,” he wrote, “Our inclination toward grass, which has the force of a tropism, is frequently cited as a prime example of ‘biophilia.'” While the word “biophilia” was used earlier as a psychology term for a sense of self-preservation, a more current usage was adopted in the late 1970s. As Pollan explains, humans tend to have an affinity and a love for the natural world. We want to put our feet in the grass, feel the sun on our faces, and walk under the trees.