Maps have always helped us know where we are; some tell us where we are going. Among new ones being drawn are those that project our future. They include maps of the world's potential solar, wind and water energy supplies.
This century will see a dramatic increase in renewable energy as demand rises and costs drop. It will take decades, but is likely to be as transformative as was the switch from coal to oil and gas. An optimist might forecast that this will include a reduction in conflict, a realist might agree, but new conflicts can arise.
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