  A classification scheme for rocky planets is proposed, based on a description
of the Earth System in terms of the Landau-Ginzburg Theory of phase
transitions. Three major equilibrium states can be identified and the
associated planetary states or phases are: Earth-like Holocene state; hot
Venus-like state; cold Mars-like state. The scheme is based on an approach
proposed to understand the Earth transition from the Holocene to the
Anthropocene, driven by the impact of the human action on the Earth System. In
the present work we identity the natural conditions that cause transformations
on the planets forcing them into one of the states identified above. We discuss
how the parameters that describe these transformations can be related with
exoplanets observables. In analysing the relevant physical parameters, we were
stroke by the similarities between Earth and Venus, and how likely is that the
Anthropocene transition may lead to hot-house Earth scenario.
