| http://www.w3.org/ns/prov#value | - The growth of young Wisconsin trees increased by 60%, and tree ring width expanded by almost 53%, as atmospheric carbon dioxide concentrations increased from 316 ppm in 1958 to 376 ppm in 2003, researchers calculated.University of Minnesota scientists compared the growth of trees and other plants during the first half of the twentieth century (which included the terrible Dust Bowl years), when CO2
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