American cities seem to be the hub for climate change strategy these days. For many state governments, the prospect of implementing incremental changes to how they produce, sell and benefit from power is a fight-or-die issue that will ultimately be born out in the Supreme Court. But for many of their cities, like Seattle, San Francisco, New York and even Charleston, West Virginia — the heart of a coordinated challenge to the Environmental Protection Agency — change is, well, just common sense.