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Lewis Ziska, a plant physiologist with the U.S. Department of Agriculture, examines rice growing in his laboratory in Beltsville, Md. Ziska and his colleagues are conducting experiments to find out how rising carbon dioxide levels affect the nutrient profile of plants. Plant physiologist Julie Wolf harvests peppers to study changes in vitamin C, lower right. | M. Scott Mahaskey/POLITICO

Lewis Ziska, a plant physiologist with the U.S. Department of Agriculture, examines rice growing in his laboratory in Beltsville, Md. Ziska and his colleagues are conducting experiments to find out how rising carbon dioxide levels affect the nutrient profile of plants. Plant physiologist Julie Wolf harvests peppers to study changes in vitamin C, lower right. | M. Scott Mahaskey/POLITICO

Lewis Ziska, a plant physiologist with the U.S. Department of Agriculture, examines rice growing in his laboratory in Beltsville, Md. Ziska and his colleagues are conducting experiments to find out how rising carbon dioxide levels affect the nutrient profile of plants. Plant physiologist Julie Wolf harvests peppers to study changes in vitamin C, lower right. | M. Scott Mahaskey/POLITICO

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