Whi.h b.ri ld Lng materrul*o.r1.

nce upon a time th"r" were thr"" littl" pigr. (Great-gr"t d"hildr"o of th ones yo\r .rr"d to know.) Eu"h trotted off into th" *orld to b'trild hi. h"and fortut". Th" first two pigs tho.rght or,ly of th"*r"l.res "td littl" of o.rr pluo. ut d "hote to build *ith steel u^d "or," rete. Thny didn't care that it took ,,ir," ti*. more energy to mahe a steel stud thut u *ood stud. Or that concrete productio 1"".r", fi..e times more r"liJ waste thut *ood.

M"ut *hile, the thi"J ur,d r.i."st pig "hor" to build *ith u ""r,"*ubl b..ildi"g matenaT_*ood. Just kr,o*irtg *ooJ was repl"oirh"d *ud" hi* f""1 goo(