  A finite Green-Kubo thermal conductivity in a one-dimensional momentum
conserving system was reported recently by Garrido et al [Phys. Rev. Lett.,
vol. 86, 5486 (2001)]. We first comment on the apparent contradiction with an
earlier result of Prosen and Campbell [Phys. Rev. Lett., vol. 84, 2857 (2000)].
We then point out certain inconsistencies in their results and disagreements
with our own results.
