I think the question of CO2 in the process of recycling is an interesting one. For me there’s an additional question of scarcity of petroleum that makes our continued use of virgin plastic problematic. If we’re going to continue to use plastic products in buildings, I think the material scientists and product manufacturers need to design for end-of-life recycling in the cradle-to-cradle sense. Not just a takeback program, but actual recycling of old product into new product. Litter was conceived of as a problem for the consumer, not the manufacturers, and I think that in the building industry and outside it we need to revise the script.