(a) share of separately collected waste; (b) share of provincial municipalities and provincial population affected by the new ‘waste tariff’ regime, which replaced the previous Italian ‘waste tax’ regime. According to the new law, that has actually been in a transitory implementation phase since its 1999 introduction, the tariff should ideally move waste management towards a full-cost pricing/polluter pays principle (PPP) based system; (c) percentage of waste management costs covered by the tariff; and (d) the main environmental tax in the waste realm, the landfill tax, implemented at the regional level in Italy.