There's no doubt if you could go 5, 10, 15 million years into the future and dig down to 2016, you would be able to find the geological evidence that humans occupied the planet.

If we want to know how the Earth's biosphere is going to respond to the things that humans are doing to the planet right now, the only evidence that we have is how biotic systems have responded in the past.

There's no doubt if you could go 5, 10, 15 million years into the future and dig down to 2016, you would be able to find the geological evidence that humans occupied the planet.

In our case, we are in the Cenozoic Era, which started at the end of the time of the dinosaurs. We are in the Quaternary Period, which is within the Cenozoic Era. And within the Quaternary, we are in the Holocene Epoch.

The technical definition of the Holocene has to do with the extinction of a snail species in Sicily.

We're changing things, in many cases in irreparable ways, and that will certainly be recorded in the geological record.

Certainly, we have entered into a new age on our planet.