  We argue that clustering of color sources, leading to the percolation
transition, may be the way to achieve deconfinement in heavy ion collisions.
The critical density for percolation is related to the effective critical
temperature of the thermal bath asociated to the presence of strong color
fields inside the percolating cluster. We find that the temperature is
rapidity, centrality and energy dependent. We emphasize the similarities of
percolation of strings with color glass condensate.
