The U.S. Environmental Protection Agency will roll out more regulations on greenhouse gases and other pollution to help fight climate change, but they will not be as strong as action by Congress, a senior administration official said.

The agency “has a huge role to play in continuing the work to move from where we are now to lower carbon emissions”, said the official, who did not want to be identified as the EPA policies are still being formed.

President Barack Obama, looking to take the lead in global talks on greenhouse gas emissions, has long warned that the EPA would take steps to regulate emissions if Congress failed to pass a climate bill.