The equilibrium points for the system (6) and (7) are determined by
and by solutions of the equation:
Since 
we present 
in the form: 
, where
.
Then
is one equilibrium. Since 
this equilibrium corresponds to the
``naked'' planet, i.e. desert, when no vegetation exists and all carbon is in the
atmosphere.
The other equilibria are the solutions of the system of equation (11) and the
equation:
It is obvious that 
.