SINDYA N. BHANOO
NY Times 
March 3, 2010
To meet the Obama administration’s targets for cutting greenhouse gas emissions, some researchers say, Americans may have to experience a sobering reality: gas at $7 a gallon.
To reduce carbon dioxide emissions in the transportation sector 14 percent from 2005 levels by 2020, the cost of driving must simply increase, according to a forthcoming report by researchers at Harvard’s Belfer Center for Science and International Affairs .
The 14 percent target was set in the Environmental Protection Agency’s budget for fiscal 2010 .
In their study, the researchers devised several combinations of steps that United States policymakers might take in trying to address the heat-trapping emissions by the nation’s transportation sector, which consume 70 percent of the oil used in the United States.