translation.en: We have been living off an infrastructure stock meant for a world population of three billion, as our population has crossed seven billion to eight billion and eventually nine billion and more.
translation.zh: 我们所利用的基础设施配置， 只够三十亿世界人口使用， 而我们的人口要超过七十亿， 朝八十亿迈进， 最终会达到九十亿甚至更多。