In terms of volume, the world’s glaciers, ice caps, and permanent snow hold 5,773,000 cubic miles of water. That only represents 1.7% of the world’s total water, but it is close to 70% of the world’s total freshwater. When glaciers covered 33% of the land on Earth during the last ice age, the sea level was much lower than it is today–approximately 400 feet lower. The last time the Earth went through a period of warming, sea level was 18 feet higher.
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