  We analyze the most general version of the supersymmetric minimal see-saw
model with only two right-chiral neutrinos which are degenerate in masses at
the scale of Grand Unification. We study the renormalization effects that give
rise to non-zero CP asymmetries in the decays of these neutrinos and find that
their resonant enhancement due to small mass splitting is partly compensated by
other RG effects in the running of the neutrino
  Yukawa couplings. In spite of this compensation, the CP asymmetries can be
large enough for successful thermal leptogenesis. Moreover, they depend very
weakly on the right-chiral neutrino masses and the resulting leptogenesis can
be successful for very low reheating temerature, thereby allowing to overcome
the gravitino problem.
