Scientific American reports that Lake Mead, the reservoir created in the late 1930s by Hoover Dam on the Arizona–Nevada border, has dropped to its lowest level ever.
"The lake has been steadily growing shallower since drought began reducing the flow of its source, the Colorado River, starting in 2000 due to below-average snowfall in the Rockies". Follow the link to read the scientific arguments about whether or not this can be deemed natural climate variation or climate change.
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