“I don't know the specifics on how much energy the windows use," Julie Gilhart, fashion director at the store, told the blog at a Calvin Klein party last night. "But of course we use electricity, we use energy—but nobody can decide to go totally green overnight. It's a process. We're making a huge effort to be as green as possible, and to spread awareness to our community so they can start making adjustments, too. And we're really proud and excited about that... isn't the reindeer fun?"