re: The world's biggest deserts could be the best places for harvesting solar energy, right?

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One would think that technological improvements would lead to a greater conversion rate (efficiency) over time ... certainly long before completion of enough solar farms to cover hundreds of thousands of square kilometers.

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Technological advances might do that one day, but the solar cells won't look anything like what we have now. There are physical limitations on energy absorption. Doubling the efficiency will require different materials and designs.