
Water-proofing our food supply
By 2050, 7-8 billion people will inhabit the world's cities. They will use about 2800 cubic kilometres of fresh water - more than the whole of irrigation agriculture uses worldwide today.
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600 quadrillion calories-a-day and counting
The central issue in the human destiny in the coming half century is not climate change or the global financial crisis but the global food crisis.
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