Former Vice President Al Gore said Sunday that now is the time to act on climate change as the U.S. experiences record heat and wildfires rage across Europe. "They're saying that if we don't stop using our atmosphere as an open sewer, and if we don't stop these heat trapping emissions, things are gonna get a lot worse," Gore told ABC "This Week" co-anchor Jonathan Karl. "More people will be killed and the survival of our civilization is at stake." Gore said global warming pollution is trapping the heat equivalent of 600,000 Hiroshima-class atomic bombs. "That's why the heat records...