The price of some staple foods such as corn will more than double in the next 20 years as demand outpaces production capacity and the climate continues to change, aid agency Oxfam International warned on Tuesday.

By 2050, demand for food will rise 70% from this year, while capacity to increase food production will decline, according to Oxfam, which noted that the average growth rate in agricultural yields has nearly halved since 1990.

Oil, meanwhile, has been on the rise due to unrest in the Middle East, not only leading to higher commodity costs but also forcing deeper investment in biofuels, which Oxfam says takes away some necessary edible food sources. The grain required to fill the petrol tank of an SUV with biofuels made of corn and other plants, for example, is sufficient to feed one person for a year, the group said.

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