Environment

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A wide-ranging ban on smoking, signed into law by Vladimir Putin, has taken effect in Russia. (Associated Press)

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Overturned trucks block a frontage road off I-40 just east of 81 in El Reno, Okla., after a tornado moved through the area on Friday, May 31, 2013. (Associated Press)

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Cars that were damaged by a tornado in parking lot at Canadian Valley Technical Center on State Highway 66, west of Banner Road, Friday May 31, 2013 in El Reno, Okla. (Associated Press)

** FILE ** This undated file image released by the British Health Protection Agency shows an electron microscope image of a coronavirus, part of a family of viruses that cause ailments including the common cold and SARS, which was first identified last year in the Middle East. (AP Photo/Health Protection Agency, File)

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** FILE ** Australia's Prime Minister Julia Gillard makes a statement to the media after a leadership ballot in Canberra, Australia, March 21, 2013. (Associated Press)

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A crane removes a container from a ship at the Port of Baltimore's Seagirt Marine Terminal on Friday, March 1, 2013. (AP Photo/Patrick Semansky)

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Marine Staff Sgt. David Denseley (center) from Salt Lake City helps members of the Afghan National Army clean out the bore of a 60 mm mortar at a mortar range in Helmand province. (U.S. Marine Corps)

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The housing market is heating up again in 20 top metropolitan areas, according to the Standard & Poor’s/Case-Shiller index. Relatively few homes have been built since the 2008 collapse. (Associated Press)

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Rising incomes in China, which is the world's No. 2 economy, have resulted in a surge in demand for gold jewelry and other luxury goods.

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Damaged railcars lie on the ground near Rockview, Mo. on Saturday, May 25, 2013. Authorities said a highway overpass collapsed when rail cars slammed into one of the bridge's pillars after a cargo train collision. Seven people were injured, though none seriously. (AP Photo/KFVS, Michael Mohundro)

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Emergency personnel respond to the scene of a train derailment near Rockview, Mo., on Saturday, May 25, 2013. The National Transportation Safety Board has launched an investigation into the cause of a cargo train collision that partially collapsed a highway overpass in southeast Missouri, injuring seven people. (AP Photo/The Southeast Missourian, Fred Lynch)