Ntuj Hloov 5 yam teeb meem ntawm txhua yam nyob ib puag ncig uas peb yuav tsum xav txog (5 environmental problems) 5 yam teeb meem ntawm txhua yam nyob ib puag ncig uas peb yuav tsum xav txog. (5 environmental problems we to consider) 5 yam teeb meem no yog 5 yam uas ua teeb meem rau lub ntiaj teb zim txwv no, yog
Kev teeb tsa yawg Anutin’s rov los ua thawj pwm tsav dua, puas yuav coj kev ruaj ntseg rau Thaib teb, tom qab 20 xyoo ?
