translation.en: It's fantastic for them and their families, but we've got two billion people in the global middle class today, and this swells that number to five, a big challenge when we already have resource scarcity.
translation.zh: 对于这些人和他们的家庭这是个天大的好事儿。 但是，，我们现在已有二十亿的中产阶层， 加在一起，就膨胀成了五十亿！ 这对于我们现已紧缺的自然资源是个巨大的挑战。