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shelter from their own homes. jessica parker, bbc news, in kyiv. one of the global effects of the war in ukraine has been wheat becoming more scarce and more expensive in many countries — because of the disruption to grain from ukraine. but there's also a need for new varieties of wheat better able to cope with disease and climate change. rebecca morelle has more archive: wheat. in britain, the most momentous harvest of all time. it's a crop we've long relied on. wheat being harvested in 19116. their enemies are wind and rain. it was the start of a farming revolution, growing only a few varieties chosen to produce as much grain as possible. every ear counts.