MItt Romney, in his acceptance speech at the Republican National Convention:
"President Obama promised to begin to slow the rise of the oceans and to heal the planet," Romney said. "My promise is to help you and your family." He got a standing ovation [for promising inaction on the threat of climate change]
President Obama, in response, at the DNC:
"And yes, my [energy] plan will continue to reduce the carbon pollution that is heating our planet because climate change is not a hoax. More droughts and floods and wildfires are not a joke. They're a threat to our children's future. And in this election, you can do something about it," Obama said, to a roar of approval from the hall.
It's something from the President. Perhaps as much as a line in the sand.