Cov pa roj carbon dub kuj tseem siv rau hauv kev tsim cov yas, qhov twg nws ua raws li cov khoom siv ntxiv, txhim kho cov khoom siv ntawm cov yas.
Cov pa roj carbon dub cov khoom tshwj xeeb ua rau nws muaj kev xaiv nrov rau ntau qhov kev lag luam, suav nrog cov khoom siv roj hmab.
