Today, the earth’s human population totals slightly more than seven billion, but the livestock population at any given time numbers more than 150 billion. The direct ecological footprint of the livestock population is larger than that of the human population, with rapidly rising global meat consumption becoming a key driver of water stress by itself.
如今，地球人口总数略高于70亿，但任何时候的牲口数量都超过1500亿。随着全球肉类消费的迅速增长本身已成为水压力的主要推动因素，牲口数量的直接生态足迹比人类更大。