  The interplay of Umklapp scattering from a periodic potential and other
scattering processes determine the conductivity of (quasi) one-dimensional
metals. We show that the transport at finite temperature is qualitatively and
quantitatively strongly influenced by a number of approximate conservation
laws. Typically, not the strongest but the second strongest scattering
mechanism determines the dc-conductivity. We discuss the optical conductivity
both of strongly anisotropic, quasi one-dimensional Fermi liquids and of
Luttinger liquids.
