There are 5 mass extinction in earths history and currently you are in the 6 which started?

The 6th extinction is being caused by MANKIND.

According to the article, it started around 100,000 years ago with the beginning of the Homo Sapiens species, and entered a second phase around 10,000 years ago with the beginning of agriculture.

Certainly some species extinctions have been linked to ancient man including likely the Woolly Mammoths about 20,000 years ago. There is debate on whether Homo Sapiens also killed off their cousins, the Neanderthals when the Homo Sapiens arrived in Europe.

The extinction of the Dodo Bird in 1681 was a direct result of human actions.

And, more recently there has been an acceleration of loss of species.