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The crystal blue water of Lake Tahoe is getting clearer. Clarity in the alpine lake has improved for two years in a row.

Lake Tahoe started getting murkier in the middle of the 20th century, when increasing development meant more silt washed into the lake. Since then, scientists have coached developers on how to do less harm, especially by diverting stormwater from the lake, so it doesn't wash in as much sediment.

And something is working, though we don't actually know what, said University of California-Davis scientist Geoff Schladow.
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