Percolation, multiparticle production and J/psi suppression in heavy ion collisions

We discuss a simple approach to heavy ion collisions, a model with string a bsorption and fusion (leading to percolation phase transition), which we us e to describe J/Psi suppression, multiplicity distributions and transverse energy distributions. For J/Psi suppression, the model qualitatively agrees with NA50 data and makes precise predictions for RHIC and LHC. For multipl icity and E-T distributions, the model shows that they are not sensitive to the percolation phase transition; the effect of string fusion may be detec table in high statistics experiments.