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If Earth overheats, can it be artificially cooled? Should the effort begin now? Who would decide? The very idea of "geoengineering," and the unknown risks of tweaking our climate, leaves many scientists with more questions than answers. AP Photo/Courtesy of NASA hide caption

itoggle caption AP Photo/Courtesy of NASA

Science

To Fix Climate Change, Scientists Turn To Hacking The Earth

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Former White House Chief of Staff Rahm Emanuel speaks at his election night party on Feb. 22, 2011, in Chicago. As mayor of Chicago, Emanuel has faced major challenges, ranging from a ballooning deficit to education, the economy and crime. Kiichiro Sato/AP hide caption

itoggle caption Kiichiro Sato/AP

Around the Nation

For Chicago Mayor Rahm Emanuel, A Mixed Midterm Report Card

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So far, the tobacco industry has paid more than $100 billion to state governments as part of a settlement. While smoking is down among young people and even adults in some areas, it's still unclear where much of that money has gone. Carolyn Kaster/AP hide caption

itoggle caption Carolyn Kaster/AP

Business

15 Years Later, Where Did All The Cigarette Money Go?

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