Global warming, the current period of climate change, is melting the Arctic permafrost. This permanently frozen ground is thawing, and the ice is draining deeper into the ground, causing lakes to disappear. These satellite images from NASA display how lakes in the same area of Siberia, Russia, have diminished and even disappeared between 1973 and 2002.

Satellite imagery courtesy NASA Earth Observatory

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permafrost
permafrost Encyclopedic Entry

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Encyclopedic entry. Permafrost is a permanently frozen layer below the Earth’s surface. It consists of soil, gravel, and sand, usually bound together by ice.

bog
bog Encyclopedic Entry

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A bog is a wetland of soft, spongy ground consisting mainly of partially decayed plant matter called peat

lake
lake Encyclopedic Entry

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A lake is a body of water that is surrounded by land. There are millions of lakes in the world.