与此同时，人类饲养家畜的数量达到14亿，它们产生的甲烷也对热带雨林产生破坏作用，从而导致二氧化碳的增加和物种灭绝的加速。
At the same time, the methane-producing cattle population has risen to 1.4 billion, contributing to the increasing rate of destruction of tropical rainforests, which releases carbon dioxide and contributes to faster species extinction.