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very complicated material. which is very interesting to study. >> yeah. >> in addition to that we are made of water. >> that's true. that's true. so yesterday we were up on bosson glacier. >> ah, yes. >> and we talked to all of the mountaineers, lifetime residents of chamonix who say it is moving at an alarming rate. but are other glaciers around the world expanding? at the same rate? some skeptics would say, yeah, these glaciers are shrinking, but others are growing in different hemispheres. is that true? >> yeah. well, i can say that more than 95% of glaciers which are monitored currently are retreating. >> 95% of the world's glaciers are retreating. >> yeah. >> for over a century, this train has been taking folks up to the longest glacier in france. but the first visitors wouldn't recognize the place today. >> that's right.