  In a three-dimensional Fermi liquid, quasiparticles near the Fermi surface
may possess a Berry curvature. We show that if the Berry curvature has a
nonvanishing flux through the Fermi surface, the particle number associated
with this Fermi surface has a triangle anomaly in external electromagnetic
fields. We show how Landau's Fermi liquid theory should be modified to take
into account the Berry curvature. We show that the "chiral magnetic effect"
also emerges from the Berry curvature flux.
