The WSJ says:
I have a front-row seat for this: Boulder, always a nexus of green policy, and its bedroom communities are starting to brush up against Denver's upper-middle-class northern suburbs, consisting entirely of covenant-controlled neighborhoods. (HT: TigerHawk.)
In neighborhoods across the country, there's a battle brewing: the environmentalists vs. the aesthetes.
As "green"-minded homeowners move to put in new energy-efficient windows, solar panels and light-reflecting roofs, they are bumping up against neighbors and local boards that object, saying the additions defy historic-district regulations, will look ugly or damage property values.