A team of geologists has concluded, after studying sites around the globe, that a tiny, deep lake in southern Ontario should mark the birth of the modern world.
A few layers of sediment from around 1950 at the bottom of Crawford Lake, they say, show more clearly than anywhere else how human activities have changed the planet’s functioning to the extent that a new geological epoch should be declared: the Anthropocene, or the age of people.
“It’s
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