In search of the Anthropocene Epoch
For more than 11,000 years, we have been living in a period of geological time called the Holocene.
But researchers say our planet is undergoing a rapid transition, so much so that we have shifted into a new epoch: the Anthropocene, the age of humans.
The only problem is they are yet to agree on exactly when it started.
The BBC's science correspondent Rebecca Morelle reports for Newsnight.