Dark-sky initiative out to save stars, and energy

The International Dark Sky Association began from a desire to preserve the nighttime views of the sky, often obscured by urban light pollution (e.g. the Interstate gas station with enough sky-bound light to show the Apollo mission the way to the moon). Starting in Flagstaff, Arizona, where light pollution has encroached on the view from a nearby observatory, the dark sky aficionados are trying to convince other urban areas that light pollution doesn't just ruin beautiful star-scapes, it wastes energy.

This panel from their brochure highlights (pardon the pun) the difference: