  We consider a multiple tunneling process into a quantum dot capacitively
coupled to a dissipative environment. The problem is mapped onto an anisotropic
Kondo model in its Coulomb gas representation. The tunneling barrier resistance
and the dissipative resistance of the environment correspond to the transverse
and the longitudinal Kondo couplings respectively. We thus identify a line in
the parameter space of the problem which corresponds to a zero-temperature
Berezinskii-Kosterlitz-Thouless like phase transition. The physics of coupling
to the environment is elucidated and experimental consequences of the predicted
transition are discussed.
