Question

To illustrate the problem of the collective rate of consumption on sustainability, if everyone on Earth lived the lifestyle of a traditional Indian villager, it is arguable that even 12 billion would be a sustainable world population. If everyone lives like an upper-middle-class North American, the level of population above which it would be unsustainable is ______.

A. 2 billion

B. 4 billion

C. 6 billion

D. 8 billion

Answer

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