In our most hopeful visions of the future, giant swathes of unused land are covered with solar panels, we've figured out how to efficiently channel solar energy into the grid, and everything is wonderful. A major problem, though, is that the areas ideal for huge solar farms – open plains and deserts in hot countries – also tend to be arid, windy, and filled with sand or dust. These particles stick to the solar panels' surfaces, making them both less effective and more expensive...
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