"The combination of population growth and the growth in consumption is a danger that we are not prepared for and something we will need global co-operation on."

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Of the twenty or so civilizations known to modern Western historians, all except our own appear to be dead or moribund, and, when we diagnose each case... we invariably find that the cause of death has been either War or Class or some combination of the two.

— Arnold J. Toynbee