Just a little something about PVC piping.....

Beyond serving as a cost-effective, efficient and durable means of meeting plumbing needs, plastics can serve as a green solution. For example, the manufacturing of PVC pipe can provide an overall savings of energy compared to alternative materials. A 1991 study by Franklin & Associates indicated that the manufacture of pressure piping used in the building, construction and transportation industries required 56,497 trillion fewer BTUs than iron and concrete/aggregate alternative pipe. Also, because PVC pipe and fittings are lighter in weight than alternative piping materials, they can save energy in transportation.