Last year the Obama administration forecast revenues of $646 billion (407 billion pounds) in the years 2012-2019 from an emissions trading program that formed the crux of its proposal to fight global warming.
The legislation that contains that proposal is now stalled in the U.S. Senate, and cap-and-trade -- which sets limits on greenhouse gas emissions and allows companies to trade permits to pollute -- may be cut from a final bill if one is passed.
The $646 billion revenue projection is no longer in the budget, the administration official told Reuters.
Unlike last year, we do not show an assumed amount of cap- and-trade revenue since the exact nature of the legislation remains in flux, the official said.
The trading system had been the keystone to President Barack Obama's plan to reduce emissions blamed for global warming, although he did not mention cap-and-trade last week in his State of the Union address when calling for comprehensive climate legislation.
Some interpreted the omission as a signal that he would not actively pursue a wide-ranging climate bill this year. White House aides, however, are still working hard to advance legislation among lawmakers.
The official said the administration would insist any climate legislation be paid for without adding to the deficit.
We assume neither a specific spending and revenue level -- but stand by the same principle that the policy as a whole must be deficit-neutral, he said.The $646 billion figure a year ago was based on a presumption that a U.S. law to limit emissions would be in place by 2012. A climate law is crucial to Obama's efforts to get international momentum behind efforts to fight global warming and craft a follow-up pact to the Kyoto Protocol.
The House of Representatives has already passed a bill with a cap and trade component.
A Senate version is still in the works, but chances of passage may be hindered by the looming election in November as lawmakers fear the repercussions of supporting a measure that some say would drive up energy costs for consumers.
(Editing by Sandra Maler)





![Introducing Skywhale: Canberra, Australia’s Controversial $300K Centenary Balloon [PHOTOS] Introducing Skywhale: Canberra, Australia’s Controversial $300K Centenary Balloon [PHOTOS]](http://s1.ibtimes.com/sites/www.ibtimes.com/files/styles/v2_multimedia/public/2013/05/14/skywhale.jpeg)
![Meet Ahmed Angel: The Greatest Internet Superstar. Ever. [PHOTOS] Meet Ahmed Angel: The Greatest Internet Superstar. Ever. [PHOTOS]](http://s1.ibtimes.com/sites/www.ibtimes.com/files/styles/v2_medium/public/2013/05/14/ahmed-angel.jpg)


![Airbus Shows Off The First A350 XWB, The Boeing 787's Rival [PHOTOS] Airbus Shows Off The First A350 XWB, The Boeing 787's Rival [PHOTOS]](http://s1.ibtimes.com/sites/www.ibtimes.com/files/styles/v2_medium/public/2013/05/13/a350.jpg)

![Lisalla Montenegro: Meet Angels Pitcher C.J. Wilson’s New Supermodel Fiancé [PHOTOS] Lisalla Montenegro: Meet Angels Pitcher C.J. Wilson’s New Supermodel Fiancé [PHOTOS]](http://s1.ibtimes.com/sites/www.ibtimes.com/files/styles/v2_medium/public/2013/05/10/lisalla-montenegro_3.jpg)

![Swallowed By Hippo: Paul Templer, River Guide, Attacked By Hippopotamus On Africa's Zambezi River [VIDEO] Swallowed By Hippo: Paul Templer, River Guide, Attacked By Hippopotamus On Africa's Zambezi River [VIDEO]](http://s1.ibtimes.com/sites/www.ibtimes.com/files/styles/v2_medium/public/2013/05/09/hippo.jpg)













![Preakness Stakes 2013: What Time Does The Race Start? What Channel To Watch, Plus Betting Odds [Update 10:26 A.M.] Preakness Stakes 2013: What Time Does The Race Start? What Channel To Watch, Plus Betting Odds [Update 10:26 A.M.]](http://s1.ibtimes.com/sites/www.ibtimes.com/files/styles/v2_small/public/2013/05/18/orb_trainer_shug.jpg)


Like or Follow us for updates on the biggest stories!