The movie shows glaciers calving into the water as Gore discusses the effects of warming on the glaciers. But don glaciers always calve into the water when they end there?
WALT: Yes, glaciers and ice streams that terminate over water are called tidewater glaciers. They are always calving ice into water; these chunks are one source of icebergs. If things are in equilibrium, there is no loss of ice because what is calved off is replaced by snowfall further up the glacier. However, in recent years, almost all glaciers are in retreat and losing mass. Some glaciers have retreated so far that they no longer reach the water and are no longer considered tidewater glaciers. See an example of a glacier photograph pair. TED: Just to clarify, Mr. Gore’s characterization of recent dynamic events in Arctic glaciers does rest firmly on observational evidence from a variety of sources, not just on glacier pair photos like those mentioned above. It’s true that every glacierized region on Earth is experiencing retreat and thinning.
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