  The concept of environmental interface is defined and analyzed from the point
of view of the possible source of non-standard behaviour. The energy balance
equation is written for the interface where all kinds of energy transfer occur.
It is shown that under certain conditions, the discrete version of the equation
for the temperature time rate turns in to the well-known logistic equation and
the conditions for chaotic behaviour are studied. They are determined by the
Lyapunov exponent. The realistic situation when the coefficients of the
equation vary with time, is studied for the Earth-environment general system.
