Niaj hnub no, nrog kev nthuav dav ntxiv ntawm cov kev txhawb nqa hauv lub tebchaws, cov peev txheej ntawm cov ntawv thov kev tiv thaiv hluav taws xob ntse tau maj mam nthuav dav mus rau ntau qhov chaw, xws li cuaj qhov chaw me me, cov tsev siab siab, kev lag luam complexes, petrochemicals, aviation tshav dav hlau, chaw ua si thiab lwm yam i. ..
Nyeem ntxiv