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
Vaj Qhia Leo 14 mus tsham cov neeg laus. Nws ua thaj txi Ntuj thiab ntsib cov tub tshaj Ntuj Lus nyob As Nkos Las.
