Annemarie Wyss heard a scream and turned around. That's when she saw what climate change looks like in the Swiss Alps: "A huge piece of glacier started to slide. I saw it break off. Within minutes the banks of the river at the foot of our house had been flooded."

Wyss has been renting out rooms in Grindelwald, a well-known Swiss ski resort near Mt. Jungfrau and Mt. Eiger, for dozens of years. She has seen it all: avalanches, flash floods, the force of nature. But never anything like this. "Not this big, not this fast," she said. "Of course it's our own fault. Nature is getting back at us. We're going to have to get used to surprises like this."

Brand-new Glacier Lake