Can we feed the world without destroying the planet?

Can we feed the 9-billion-plus people anticipated to live on this planet in 2050 without destroying Earth’s life support systems? We can if we successfully pursue sustainable food production on five key fronts: halting farmland expansion in the tropics, closing yield gaps on underperforming lands, using agricultural inputs more strategically, shifting diets, and reducing food waste. Jon Foley at GreenBiz Forum 2012.