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.

it’s coming….sooner or later

dotearth.blogs.nytimes.com