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Soybeans growing in a field outside Lincoln, Nebraska, one of many crops whose nutrient content is shifting as a result of rising carbon dioxide levels. | Geoff Johnson for POLITICO

Soybeans growing in a field outside Lincoln, Nebraska, one of many crops whose nutrient content is shifting as a result of rising carbon dioxide levels. | Geoff Johnson for POLITICO

Soybeans growing in a field outside Lincoln, Nebraska, one of many crops whose nutrient content is shifting as a result of rising carbon dioxide levels. | Geoff Johnson for POLITICO

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