Global food costs climbed for a fourth month in May, the longest string of gains since early 2011, according to the United Nations’ Food & Agriculture Organization. The index, which tracks prices for 73 food products worldwide, rose about 2.1 percent last month, the biggest gain since March 2014. Surging costs for sugar helped push the index higher, as dry weather eroded crops in parts of Asia, while prices for grain, meat and dairy products also increased.

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