依家我哋知道荒漠化係由家畜導致嘅 大多數係由於牛 、 綿羊同山羊 過度放牧而食晒啲植物 令土壤外露同釋放甲烷而導致
We now know that desertification is caused by livestock, mostly by cattle, sheep and goats overgrazing and eating plants that expose the soil and release methane