Here in the UK the local authorities, in the city in which I live, tell me that they spend £1.96 million per year mowing grass. In other parts of the city managers of sports fields and golf courses are all spending money to keep grass a few millimetres high and thousands of private citizens are doing the same thing in their gardens. Why is our culture so obsessed with very short grass? Obsessively mown grass is poor in wildlife, whereas long grass full of wild flowers can be very rich in biodiversity. If you want to save the world, try cutting the grass less!