Obama mocks skeptics of climate change as ‘flat-Earth society’ - The Hill's Blog Briefing Room
Earlier in his remarks, Obama said the "overwhelming judgement of science, of chemistry, of physics, and millions of measurements" put "to rest" questions about pollution affecting the environment.
"The planet is warming. Human activity is contributing to it," Obama said.
"We know that the costs of these events can be measured in lost lives and lost livelihoods."