Let's get one thing out of the way right now: The question of whether or not a new geologic epoch has "really started" is precisely as stupid as the question of whether or not Pluto is "really" a planet. The definitions of geologic eons, eras, and epochs are not objective truths about the history of the planet that are simply waiting for us in the rock. The geologic time scale is made up by geologists, for geologists as a matter of convenience. So Greg Laden is making a category error when he dismisses both the Anthropocene and the Holocene as scientifically invalid - the worst thing you can…
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