  We have performed hydrodynamical simulations to investigate the effects of
galactic winds on the high-redshift (z=3) universe. Strong winds suppress the
formation of low-mass galaxies significantly, and the metals carried by them
produce C IV absorption lines with properties in reasonable agreement with
observations. The winds have little effect on the statistics of the H I
absorption lines, because the hot gas bubbles blown by the winds fill only a
small fraction of the volume and because they tend to escape into the voids,
thereby leaving the filaments that produce these lines intact.
