▁environmental , ▁economic ▁or ▁social ▁l ens . ▁The ▁imp lication ▁is ▁that ▁sust ain ability ▁can ▁be ▁incorpor ated ▁to ▁all ▁three ▁aspects ▁of ▁the ▁Tri ple ▁B ottom ▁Line : ▁people , ▁planet , ▁profit . ▁ ▁The ▁definition ▁of ▁sust ain able ▁or ▁sust ain ability ▁has ▁been ▁widely ▁accepted ▁as ▁the ▁ability ▁to ▁meet ▁the ▁needs ▁of ▁the ▁current ▁generation ▁without ▁de ple ting ▁the ▁resources ▁needed ▁to ▁meet ▁the ▁needs ▁of ▁future ▁gener ations . ▁It ▁“ prom otes ▁a ▁bio - cent ric ▁view ▁that ▁places ▁the ▁human ▁presence ▁within ▁a ▁larger ▁natural ▁context , ▁and ▁focus es ▁on ▁constraints ▁and ▁on ▁fundamental ▁values ▁and ▁behavior al ▁change .” ▁ ▁David ▁Or r ▁defines ▁two ▁approaches ▁to ▁sust ain ability ▁in ▁his ▁book ▁E colog ical ▁Liter acy : ▁“ techn ological ▁sust ain ability ” ▁and ▁“ ec ological ▁sust ain ability .” ▁ ▁“ Te chn ological ▁sust ain ability ” ▁emphas izes ▁the ▁anth rop oc ent ric ▁view ▁by ▁foc using ▁on ▁making ▁techn ological ▁and ▁engineering ▁processes ▁more ▁efficient ▁whereas ▁“ ec ological ▁sust ain ability " ▁emphas izes ▁the ▁bio - cent ric ▁view ▁and ▁focus es ▁on ▁en abling ▁and ▁maintain ing ▁the ▁essential ▁and ▁natural ▁functions ▁of ▁e cos ystem s . ▁ ▁The ▁sust ain ability ▁movement ▁has ▁gained ▁momentum ▁over ▁the ▁last ▁two ▁dec ades , ▁with ▁interest ▁from ▁all ▁se ctors ▁increasing ▁rapidly ▁each ▁year . ▁In ▁the ▁book ▁Reg ener ative ▁Development ▁and ▁Design :