Republican senator Lindsey Graham unlikely to be on board at unveiling of new legislation
Battle to save California's world-leading climate change legislation is heating up with Governor Schwarzenegger vowing to "push back" against oil industry lobbyists
Senator insists bill remains on track despite Gulf oil spill and loss of Republican support
Moderate Republican says business community holds the key to passing US climate legislation
Democrats confirm they will move for a vote on the proposed climate bill ahead of immigration reforms - but it remains to be seen if they can win back support of key Republican Senator
New report shows climate change is already affecting the US and poses a threat to human health
EPA to begin economic impact assessment, despite withdrawal of senator Graham's support
Campaigners call for urgent effort to save US climate bill, while some insist proposed legislation remains fundamentally flawed
Senator Lieberman calls on White House to intervene to help win back support of key Republican Senator
Emerging countries insist legally binding treaty must be completed in time for South Africa summit in 2011