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How can we feed 9 billion?

Telegraph: Some friends had a memorable Christmas. They spent it with family in Belfast, where water could only be obtained by melting the snowman. Providentially they and the children had made a large one and it kept them going for two days, until the water supply returned. They were of course infinitely better off than my relations in Brisbane, of whom I still anxiously await word. Both cases, however, illustrate how easily the life we all take for granted can be turned upside down. True, Queensland has...