The Anthropocene is when we began to calculate "our own geological time."
The scientist who named it first chose as its beginning, "the early 19th century,
when the Industrial Revolution unleashed the energy found in fossil fuels."
Later, he declared "the nuclear tests as the real start of the Anthropocene."

Who are we in the shape of things? "It doesn’t start out with something
that looks like a monkey, and the something that looks like an ape, and
then something that looks like a human, and then all of the sudden
you've got people. It’s much more complicated than that."

"For Dr. (Tal) Dagan, evolution is still
shaped like a tree.
But over billions
of years, thousands of genes
have shuttled
the branches."