Rotorua farmers are objecting to having to pay extra in rates to cover the cost of cleaning up the region's lakes. But there's a simple principle at stake here: polluter pays. The farmers made the mess, though overstocking of cattle, excess use of fertilisers, and not caring where the runoff went ("dirty dairying" in other words). Therefore they should be the ones paying to clean it up. Giving them yet another free ride will simply encourage them to continue to engage in unsustainable, polluting practices which externalise their environmental costs onto everybody else.