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Image shows a world map with small blobs indicating the very small area required to power the world from solar panels. The text reads : These 19 contiguous areas show roughly what would be a reasonable responsibility for various parts of the world. They would be further divided many times, the more the better to reach a diversified infrastructure that localizes use as much as possible. The large square in the Saharan Desert (1/4 of the overall 2030 required area would power all of Europe and North Africa. Though very large, it is still 18 times less the total area of that desert. (area calculation does not include black border lines)