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PBS
Pbs Learning Media: Earth System: Ice and Global Warming
This video segment [3:04] adapted from NASA's Goddard Space Flight Center details how global warming may already be responsible for a significant reduction in glacial ice, which may in turn have significant consequences for the planet.
PBS
Pbs Learning Media: Antarctic Ice Movement: Part I
This video segment [3:33] adapted from NOVA explains why ice sheets move. To find out how fast they move, scientists carve a tunnel through a glacier.