PBAT yog ib hom yas uas lwj tau. Nws yog hais txog ib hom yas uas cov kab mob me me uas muaj nyob hauv xwm raug rhuav tshem, xws li cov kab mob me me, pwm (fungi) thiab algae. Cov yas lwj tau zoo tshaj plaws yog ib hom khoom siv polymer uas muaj kev ua tau zoo heev, uas cov kab mob me me hauv ib puag ncig tuaj yeem lwj tag tom qab pov tseg, thiab thaum kawg yuav tsis muaj sia thiab ua ib feem tseem ceeb ntawm lub voj voog carbon hauv xwm.
Cov lag luam tseem ceeb ntawm cov yas uas lwj tau yog cov yas ntim khoom, cov yas ua liaj ua teb, cov hnab yas pov tseg thiab cov khoom siv hauv tsev yas pov tseg. Piv nrog cov khoom ntim khoom yas ib txwm muaj, tus nqi ntawm cov khoom siv lwj tshiab yog siab me ntsis. Txawm li cas los xij, nrog kev txhim kho ntawm kev paub txog ib puag ncig, tib neeg txaus siab siv cov khoom siv lwj tshiab nrog tus nqi siab me ntsis rau kev tiv thaiv ib puag ncig. Kev txhim kho ntawm kev paub txog ib puag ncig tau coj cov cib fim zoo rau kev lag luam khoom siv lwj tshiab.
Nrog rau kev txhim kho ntawm Tuam Tshoj txoj kev lag luam, kev ua tiav ntawm Olympic Games, World Expo thiab ntau lwm yam kev ua ub no loj uas ua rau lub ntiaj teb xav tsis thoob, qhov xav tau kev tiv thaiv cov cuab yeej cuab tam kab lis kev cai thoob ntiaj teb thiab cov chaw zoo nkauj hauv tebchaws, qhov teeb meem ntawm kev ua qias tuaj ib puag ncig los ntawm cov yas tau raug them ntau dua thiab ntau dua. Tsoomfwv ntawm txhua qib tau teev tseg kev kho mob ntawm kev ua qias tuaj dawb ua ib qho ntawm lawv cov haujlwm tseem ceeb
