The budget includes revenue of $646 billion from 2012 to 2019 from such payments. Some of the money would pay for a middle-class income tax cut, some for research on solving global warming.
A wide spectrum of groups — from the Environmental Defense Fund to the Edison Electric Institute, which represents power plants — agree on the need to cut greenhouse-gas emissions, but there is disagreement over how to do it.
Lawmakers, who failed to pass a bill last year, will have to decide how much to cut emissions and how soon.
"This is going to be a very complex piece of legislation," says Rep. Ed Markey, D-Mass., who chairs a House subcommittee key to passage of a global warming bill. "In the end, politics is the art of the possible."
What has been done, what lies ahead on president?s green agenda
USA TODAY'S Traci Watson takes a look at the actions President Obama has taken on key environmental and energy issues — and the hard work yet to be done.