At the turn of the century, the term Anthropocene began gaining traction. Though still not formally accepted, the term suggests that the earth has moved into a new geological epoch due to the impact of human activities. That is, we have so impacted the earth that the human mark is written into its very geology, and will be present for epochs to come.
The Anthropocene, then, presents us with a reconception of our relationship with the earth. Like previous reconceptions (Galileo, Nasa's photograph of the Earth, Gaia), the Anthropocene prompts us toward an existential grappling with the implications of being human on this earth.