During a discussion of a recent trip to Greenland on "CNN Newsroom," Gergen claimed U.S. cities should prepare for massive flooding if polar ice caps continue to melt.
“I went [to Greenland] thinking it was a practical imperative to deal with climate change. I came away feeling it’s a moral imperative," he said. "When you see what’s happening in Greenland, it is an early -- it's an early set of signals about what’s going to happen to the globe."
"The glaciers are retreating, they're breaking off and forming icebergs," he continued. "They’re beautiful icebergs, but they’re breaking up. There is a growing danger that the icecap will melt in Greenland and we’ll have -- there won’t be a big icecap in the summer... We could have cities in the United States engulfed in floods.”
Gergen isn't the only public figure sounding the alarm on climate change. Rep. Alexandria Ocasio-Cortez, D-N.Y., recently claimed she has woken up in the middle of the night due to her fears about the climate and tried to link climate change to Hurricane Dorian.
"This is what climate change looks like: it hits vulnerable communities first," she tweeted Tuesday in accompaniment to a video of Dorian's devastation in the Bahamas. "I can already hear climate deniers screeching: “It’s always been like this! You’re dim,” etc. No. This is about science & leadership. We either decarbonize&cut emissions, or we don’t & let people die."
"We know the climate's changing and we know our storms seem to be getting bigger," he said. " ... We don't know what the cause is, but we have to react to it."