We have not yet learned the difference between yield and loot.

Sauer contrasts “yield” (a sustainable return from land or resources) with “loot” (extractive taking that leaves lasting damage). The line crystallizes his long-standing critique of modern economic and agricultural practices that treat soils, forests, water, and landscapes as mines rather than living systems. Read this way, the quote is less about a technical distinction than a moral and historical one: societies often celebrate short-term production as success while ignoring depletion, erosion, and social costs that reveal the activity to be plunder. Sauer’s phrasing implies that the failure is educational and cultural—an inability to recognize limits and to value stewardship over immediate gain.