Carbon Footprint Label

We have labels on our food to alert us as to what is in it, shouldn't we also know the environmental costs of the products we consume?  If we knew that when we drink ordinary water imported from Fiji, we are contributing X to the carbon emission crisis, would we change our habits?  How would we get manufacturers to post a simple label on all products?

The New York Times had a relevant article back in April, posted here.  Evidently, Tesco, Britian's largest supermarket chain has voluntarily introduced just such a system.  Can we import that?