  At low values of external doping graphene displays a wealth of unconventional
transport properties. Perhaps most strikingly, it supports a robust 'metallic'
regime, with universal conductance of the order of the conductance quantum. We
here apply a combination of mean field and bosonization methods to explore the
large scale transport properties of the system. We find that, irrespective of
the doping level, disordered graphene is subject to common mechanisms of
Anderson localization. However, at low doping a number of renormalization
mechanisms conspire to protect the conductivity of the system, to an extend
that strong localization may not be seen even at temperatures much smaller than
those underlying present experimental work.
