MP4 November 20, 2019 3:11 am ‘Late Night': Al Gore Calls Climate Change Most Serious Challenge Al Gore calls climate change the most serious challenge human civilization has ever faced and talks about an upcoming global event for climate change awareness. US & World Videos 1:16 Own an iPhone? You could be eligible for a payout as part of a $35 million settlement 1:54 WATCH: Animals snack on cicadas at Chicago zoo 4:59 ‘Collective failure': Families of Uvalde shooting victims file lawsuit over police response and alleged ‘cover up' 1:12 Norway, Ireland and Spain announce they are recognizing a Palestinian state 0:31 Bottlenose dolphin ends up stuck in Cape May County creek