Looking ahead in world food and agriculture : perspectives to 2050 / Conforti, Piero. Food and Agriculture Organization of the United Nations. Food and Agriculture Organization of the United Nations. Food supply. Food supply Agricultural productivity. Agricultural productivity 368 FOO 2011 A015 Or. "Agricultural Development Economic Division, Economic and Social Development Department"--Cover. Collected essays. Rome : Food and Agriculture Organization of the United nations, 2011. 2011. Text xviii, 539 p. : www.fao.org/docrep/014/i2280e/i2280e.pdf