The Revolution Will Be Clumpy

From The Sieve:

Geologists are able to tell you the exact history of the waxing and waning of glaciers over the past five million years because microscopic creatures in the ocean have been unwittingly recording this dance in their shells. Their shells are made from the carbon and oxygen found in seawater. As glaciers form, seawater is removed from the ocean and trapped on land, resulting in subtle changes in the chemistry of the ocean.These changes are recorded in the shells, which create a detailed history as they pile up on the ocean floor…

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