As the population grows, “nearly half the land in Denver’s city limits is now paved or built over,” shrinking the city's green space, according to a recent series in Denver Post. But there’s something important missing in their account. The city’s pavement problem isn’t because of a growing population of people. It’s because of a growing population of cars. It’s the roads, driveways and – perhaps most egregiously – the parking lots we’ve built to accommodate more cars.