By Michael Booth , The Colorado Sun and John Upton , Climate Central Grass fires have threatened the meadows and homes near Chatridge Court and U.S. 85 three times in five years, and firefighters work hard to keep flames from moving over the hill into thousands of homes in Highlands Ranch. (Photo from the 2016 Chatridge fire. Credit: South Metro Fire Rescue) DOUGLAS COUNTY — The future of climate change and suburban firefighting in Colorado is here, in a dull brown meadow at the corner of Chatridge Court and U.S. 85.  They know the future will arrive on this spot, because the kind of raging grass fires near thousands of suburban homes that keep emergency planners awake at night has already been here three times in five years. The Chatridge 3 grass fire on Dec. 14, just before Boulder County’s horrific Marshall fire, swept east up the hill from U.S.…