Icebergs are bellwethers of environmental changes. Their formation, movement and melting offer insights into some of the most extreme areas of the cryosphere, such as Antarctica, Greenland and the Arctic Ocean. Scientists have long monitored icebergs because of their role in regulating our climate. But what do the sounds they make reveal? Geophysicist Vera Schlindwein, professor of polar and marine seismology at the University of Bremen in Germany, joins The Excerpt to discuss these breathtaking frozen wonders.

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