The National Weather Service has issued yet another warning about the dangerous heat and fire risk that will continue to grip much of the U.S. this weekend. Jason E. Smerdon, Lamont Research professor at Columbia University’s Lamont-Doherty Earth Observatory, joined Cheddar News to talk about climate change’s role in recent heat waves. “We’re seeing these kinds of events more frequently, and we’re also seeing them simultaneously around the globe," he said, "so the story of this week has been heat waves in Europe, in the United States and in parts of Asia as well, and that’s all characteristic of a globe that’s warming up.”