Denver’s story mirrors the environmental awakening that transformed American cities from industrial powerhouses into sustainable urban centers. Founded in 1858 during the Colorado Gold Rush, Denver evolved from a dusty frontier outpost where miners and fortune-seekers converged into what locals now call the “Mile High City”—a destination where 300 days of annual sunshine meet forward-thinking environmental stewardship.
The city’s environmental journey accelerated dramatically in the 1970s when residents witnessed the infamous “Brown Cloud”—a visible layer of smog that obscured mountain views …