南极的冰量巨大，足以以1.5英里的厚度覆盖美国全境。
There is a lot of ice on antarctica-enough to cover the United States to a depth of 1.5 miles.
格陵兰和南极的冰岩芯提供了气候和环境参数的多方面的替代记录。
Ice cores from Greenland and Antarctica provide multiple proxy records of climate and environmental parameters.
事实上在18000年前，两倍于现在的南极的冰覆盖了北美的西北部。
In fact, only 18, 000 years ago (a blink of an eye in geologic time), twice this amount of ice covered the northwest of North America.
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