I'll beat you to the joke: It's such a perfect marriage of junk food and environmentalism, I'm surprised Al Gore didn't think of it first.
Introducing a regular-looking pizza box with a special touch. The difference is that the box can come apart once it's delivered by your local pie dealer. While it starts out the size of a standard pizza box, customers can break the platter-size square into four plate-size sections using scoring and perforations.
Voila--a trashy dinner service for four, with no wasting water or soap on dishes after. I guess that sorta makes this box "green," as the manufacturer claims. If annual pizza consumption numbers in the billions, as some theorize (though of course, some must be served on plates in restaurants), sure, this could have some effect if everyone used it. Okay, maybe the "green" angle is a slight stretch, but it's also true that no trees died for the box, either. It's made from 100% recycled material, which presumably can be recycled again after supper. Every little bit helps, right?