Sen. Michael Bennet (D-CO) visits with a young girl as he campaigns in downtown Colorado Springs, Colo., on Aug. 9. After surviving a tough primary challenge, Bennet is now in a close race with Tea-Party-backed Republican Ken Buck. Ed Andrieski/AP hide caption

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A bad harvest and fires in Russia have caused U.S. wheat prices to jump nearly 50 percent in recent months. Bakeries and other businesses are facing higher costs. Spencer Platt/Getty Images North America hide caption

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A wind turbine, generating power near Boston in 2006. Stephan Savoia/AP hide caption

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This is the house Bob Lynn, owner of Peak Property Development Co., remodeled in Denver. hide caption

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