The Anthropocene

In arguments pro and contra the Anthropocene, a prominent set of issues revolves around the idea of humanity as one collective species. What are the principal arguments of authors such as Steffen et al.
and Chakrabarty in favour of grasping the anthropos as thus unified? In this context, how can Callicott be seen to support Chakrabarty, and how does Chakrabarty critique Malm & Hornborg?

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