Borderline land that is on or close to a physical or chemical limit below or beyond which agricultural use ceases to be possible or leads to undesirable consequences, such as excessive erosion. Marginal land tends to be brought into production principally by population pressure, but also by such forces as demand for food in wartime (Europe in WWII for example), and the urge to profit from agricultural subsidies. Destruction of wildlife habitat is a significant collateral effect of the push to exploit the soils of marginal lands.