1. Cov khoom yog degradable thiab tsis ua paug ntawm ib puag ncig;
2. Nws yog kev siv cov khoom siv pov tseg xws li cov khib nyiab los ua cov ntaub uas tsis ua haujlwm, thiab nws yog siv rau hauv kev tiv thaiv ib puag ncig uas siv tau rau lub neej lossis kev lag luam.
3. Nws yog cov kev coj ua uas tsis ua kom muaj kuab paug rau hauv cov txheej txheem ntau lawm, uas yog qhov tseeb ib puag ncig cov khoom tsim tawm.
