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Glossary of Terms

Polar Ice
At the poles of the planet, water freezes into ice because so little light and warmth reaches those regions. The north pole is covered primarily by the Arctic and Greenland ice sheets, and the south pole is covered mostly by the Antarctic ice sheet.

During the summer of 2007, scientists tracked the largest seasonal polar ice melt on record. Melting polar ice is a symptom of climate change, and it seems to confirm that the process is happening much faster than originally predicted (see abrupt climate change). Melting polar ice contributes to sea level rise, which threatens coastal areas around the globe. Around two-thirds of the earth’s population is estimated to live near the coasts.
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