Often times, when making the case for protecting open space within cities, someone always uses the "it doesn't pay property taxes" argument. While there are many ways of suggesting that green space actually increases property values in the surrounding vacinity, you can't quite come across to that person as being legitimate. Because the numbers aren't there in front of them it's hard to convince them otherwise. What other tactics, arguments, data, etc. can be used to support to idea of more preserved open space when people are hung up on money/property taxes?