In this Dec. 21, 2018 photo, Parker Alley, 7, flies a at Four Winds-Cuatro Vientos Park, in the Westwood neighborhood in Denver. Large areas of Denver overhauled to sustain an exploding population now are so built up and paved over that residents rapidly are losing contact with nature. Excluding the undeveloped area around the airport, nearly half the land in Denver's city limits is now paved or built over — up from less than 20 percent in the mid-1970s, a Denver Post analysis of city and federal data found. And that figure could approach 70 percent by 2040. (RJ Sangosti/The Denver Post via AP)
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