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In page World population:

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In May 2008, the price of grain was pushed up severely by the increased cultivation of biofuels, the increase of world oil prices to over $140 per barrel ($880/m3),[7] global population growth,[8] the effects of climate change,[9] the loss of agricultural land to residential and industrial development,[10][11] and growing consumer demand in the population centres of China and India.[12][13] Food riots subsequently occurred in some countries.[14][15] However, oil prices then fell sharply. Resource demands are expected to ease as population growth declines, but it is unclear whether mass food wastage and rising living standards in developing countries will once again create resource shortages.[16][17]