With food scarcity driven by falling water tables, eroding soils, and rising temperatures, control of arable land and water resources is moving to center stage in the global struggle for food security. In this era of tightening world food supplies, the ability to grow food is fast becoming a new form of geopolitical leverage. Food is the new oil, Lester R. Brown writes.One of the worlds most influential thinkers.With food supplies tightening, countries are competing for the land and water resources needed to feed their people.