Whi.h b.ri 1 d rng materrul*o.r1,

nce upon a time th""" were th."" littl" pigr. (Grcat-gr"t d"hild""t "f tl ones you .r."d to know.) Eu"h trotteJ off into th" *otld t" b.rild hi. hoo and fo"t.rr,". Th" first two pigs tho..ght ooly of th"^rel.r"s u"J littl" of o.." pl"t ur,d "hore t" b.rild *ith steel ur,d "or,"rete. Th"y didn't care that it took nine tim more enersy to make a steel stuJ th"t " *ood stuJ. Or that concrete produeti< l"u.r"s fine times more ."lid waste thuo *ood.

M""t*hile, the third "od *i."st pig chose to b.rild *ith " ""r."*"b b..ildit g material-*ood. Just kt o*it g *ood was repleoith"d *"d" hi- f".l goo