people started blowing up nuclear bombs all around the world

Even New York or Shanghai may prove hard to find buried in the rocks a million years from now.But humans have put new things into the world that never existed on Earth before,like plutonium and plastics.In fact, the geologists known as stratigraphers who determine the geologic timescale,have proposed a start date for the Anthropocene around 1950.That's when people started blowing up nuclear bombs all around the world and scattering novel elements to the winds.