An F-15C Eagle aircraft returns to base after a mission during Operation Deny Flight, the United Nations-sanctioned no-fly-zone action over Bosnia and Herzegovina in 1998. Retired Navy Capt. Tom Parker, who flew no-fly-zone missions in the Balkans, says the strategy could work in Libya. But Defense Secretary Robert Gates and others argue that it wouldn't be easy.
U.S. Air Force/Getty Images
Rising crude oil prices and improved extraction methods have made exploitation of Canada's oil sands more economical. Here, a view of an oil sands mine near Fort McMurray, Alberta.
Mark Ralson/AFP/Getty Images