The United Nations says world food production must increase by up to 100 percent by 2050 and focus on greener methods to sustain an expected 9 billion population.
The U.N.'s annual World Economic and Social Survey says governments must help small-scale farms thrive to keep people fed and reduce environmental harm. The the average size farm in Africa and Asia is 1.6 hectares (2.47 acres).
The survey released Tuesday said the 2007-2008 food crisis and higher food prices this year "revealed deep structural problems in the global food system" that contribute to a warmer climate and polluted land and water.
It says two-thirds of 925 million people undernourished now live in just seven countries: Bangladesh, China, Democratic Republic of Congo, Ethiopia, India, Indonesia and Pakistan.