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k5652-18

U.S. Department of Agriculture (USDA) Agricultural Research Service (ARS) scientists measure the growth of wheat surrounded by elevated levels of atmospheric carbon dioxide near Phoenix, AZ. The Free Air Carbon Dioxide Enrichment (FACE) study’s goal is to measure carbon dioxide's effect on plants. It is the largest experiment of this type ever undertaken. USDA photo by Jack Dykinga.

  

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Taken on March 5, 2013