  An energy-balance model of global climate, which takes into account a
nontrivial role of galactic cosmic rays, is developed. The model is described
by the fold catastrophe equation relative to increment of temperature, where
galactic cosmic rays and insolation are control parameters. The comparison of
the results of a computer simulation of time-dependent solution of the
presented model and oxygen isotope records of deep-sea core V28-238 over the
past 730 kyr are presented. The climate evolution in future 100 kyr is also
predicted.
