I think aluminum is probably not a good one to have this discussion on, because the majority of the time you're going to say that aluminum has a high commodity value and you're going to want to go after that material. Generally, right now in the marketplace, you don't need a lot of additional pieces to go after that aluminum. There is already an economic incentive to go after that material.
When you start looking at some other types of plastics, for instance, the economic case starts to fall apart a little bit. But I think you need to look at it. I would expect that government would look at it and ask, what are the consequences from an economic and an environmental perspective from this material simply going to disposal?
I think you'd look at both of those factors and decide if you should be going after that material.
I think for the majority of materials you're going to say that yes, absolutely, it makes sense to go after them. But there is always going to be the question to ask: to what end?
As you start getting higher and higher percentages, it's going to be much more difficult to capture those materials. Those materials could be contaminated with other waste. So at some point you will say that the cost is too much and there is potentially a need to look at other options for that material.