  I briefly review the construction of the effective field theory of a
nonlinearly realized electroweak symmetry breaking and apply it to the study of
gauge boson pair production. I will consider WW, ZZ and \gamma Z production at
linear colliders as reference illustrative examples. I will show that in all
cases a consistent effective field theory treatment allows to encode the
dominant new physics effects entirely as gauge-fermion vertex corrections. From
naive dimensional analysis one expects these corrections to be at the per mille
level. However, they grow with energy, such that at TeV colliders (LHC and
futures linear collider facilities) these new physics effects can easily amount
to 20% corrections to the production cross sections.
