Wheat prices have staged the most drastic rise in more than 50 years, as a drought in Russia fuels growing worries that it could lead to a global shortage of the grain.
Harsh heat and a lack of rain in Russia have killed half of the crop in some hard-hit areas. The slump in production in one of the world's most fertile breadbaskets has pushed prices up 62% since early June, and last month saw the biggest and fastest increase since 1959.