Paper or plastic may be a question of the past. And that would be good. With oil prices and carbon dioxide levels at all-time highs, there’s no time like the present to address some of our more wasteful consumer practices. First up: disposable bags (although bottled water isn’t too far behind). The future of shopping may be a lot like what you see in Dublin, where they passed a law in 2002 that places a 33-cent tax on disposable bags. Within weeks, plastic bag use dropped 94% replaced largely by the reusable grocery bags that are getting more common in the US every day.