  We present a method to calculate $\nu \bar{\nu}$ energy losses from neutron
star crusts, which automatically takes into account for collective effects, and
allows to calculate the total emissivity without a separate consideration of
particular processes. We show that the formula we obtain describe the known
results for the emissivity due to plasmon decay and Bremsstrahlung from
degenerate electrons, when one of this processes dominates. In the case of low
temperatures, our formula gives a suppression of the electron vector
weak-current contribution to $\nu \bar{\nu}$ Bremsstrahlung, due to the
collective effects discussed in this paper.
