Humanity’s impact on the Earth is so profound that we’re creating a new geological time period. Geologists have named the age we’re making the Anthropocene. The changes we’re making to the atmosphere, oceans, landscape and living things will leap out of the rocks forming today to Earth scientists of the far future, as clearly as the giant meteorite that ended the Age of the Dinosaurs does to today’s researchers. In this four part series, science journalist Gaia Vince looks at the impact of our planetary transformations from the perspective of geological time. When was the last time comparable events happened in Earth history, and are what are the tell-tale marks we’re making on the planet that define the Anthropocene?