The new planet we live on is inherently more expensive than the old one. The wind blows harder; more rain falls; the sea rises. It would cost more to settle it if we were just arriving from outer space…
— Bill McKibben, Eaarth. http://www.powells.com/book/eaarth-making-a-life-on-a-tough-new-planet-9780805090567/2-14

McKibben continues: "“…but the price tag comes because we built it up so thoroughly during our ten thousand years and now must defend the investment.”