The former vice-president and climate champion, Al Gore, has called on Barack Obama to seize the moment and use his re-election victory to push through bold action on climate change.
The president has faced rising public pressure in the wake of superstorm Sandy to deliver on his promise to act on global warming.
But none of those calling on Obama to act carries the moral authority of Gore, who has devoted his post-political career to building a climate movement.
Other environmental leaders are also trying to seize the moment. Activists have called a demonstration at the White House on 18 November to demand Obama block the Keystone XL pipeline, designed to expand production from the Alberta tar sands by pumping crude to Texas refineries.
Gore said he supported their campaign. “I do agree with those who are trying to stop the Keystone pipeline. The tar sands are just the dirtiest source of liquid fuel you can imagine,” he said. “At a time when we are desperately trying to bend the emissions curve downwards it is quite literally insane to open up a whole new source that is much more carbon intensive and that makes the problem worse.”