Atlanta Journal Constitution: Think of it as the intersection of good times and good intentions. A new sign at the corner of Virginia and North Highland avenues proclaims the intown Atlanta shopping and dining district a ‘carbon-neutral zone.’ What it doesn`t say is that Virginia-Highland also claims to be the nation`s first such zone. While this could be seen as the latest chapter in the annals of green marketing — another emission in all the talk about global warming — there`s actually substance behind …