Investors are pouring into farmland in the U.S. and parts of Europe, Latin America and Africa as global food prices soar. A fund controlled by George Soros, the billionaire hedge-fund manager, owns 23.4 percent of South American farmland venture Adecoagro SA. Hedge funds Ospraie Management LLC and Passport Capital LLC as well as Harvard University's endowment are also betting on farming. TIAA-CREF, the $466 billion financial services giant, has $2 billion invested in some 600,000 acres (240,000 hectares) of farmland in Australia, Brazil and North America and wants to double the size of its investment. The growth in demand for food, spurred by the rising middle classes in China, India and other emerging markets, shows no signs of abating. Food prices in June, as measured by a United Nations index of 55 food commodities, were just slightly below their peak in February. The UN's Food and Agriculture Organization said in a June report that it expects food costs to remain high through 2012. So many investors have rushed to capitalize on food prices in the past three years that they may be creating a farmland bubble. The Federal Reserve Bank of Kansas City, which covers Colorado, Kansas, Nebraska and other agricultural states, said in May that farmland prices had surged 20 percent in the first quarter compared with a year earlier.