  This paper summarizes top quark cross-section measurements at the Tevatron
and the LHC. Top quark pair production cross-sections have been measured in all
decay modes by the ATLAS and CMS collaborations at the LHC and by the CDF and
D0 collaborations at the Tevatron. Single top quark production has been
observed at both the Tevatron and the LHC. The t-channel and associated Wt
production modes have been observed at the LHC and evidence for s-channel
production has been reported by the Tevatron collaborations.
