Yale Environment 360: An area about the size of Japan -- roughly 140,000 square miles -- has been purchased or leased by foreign entities for agricultural use during the last 15 years, according to a report by the Worldwatch Institute. An additional 58,000 square miles are under negotiation, the report found. Land grabbing, a term for the purchase or lease of agricultural land by foreign interests, has emerged as a threat to food security in several nations. Globally, over half of this land is in Africa, especially...