Many of the greatest problems facing the planet will hit hardest in 50 to 100 years. Climate change, which already wreaks havoc through local droughts and heat waves, could well unleash global-scale havoc in a few decades. Higher temperatures and changing rainfall patterns could cut global food production sharply and trigger mass famine in needy parts of the world; conceivably, the great ice sheets of Greenland and Antarctica could partially collapse and raise the sea level by several meters…

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