Much of the Western half of the US is in a severe drought, and parts of the Southwest are “exceptionally dry,” the worst category, according to US Drought Monitor. Taking this into account, the iconic Hoover Dam has just recorded the smallest amount of water inside Lake Mead since the 1930s. The damming of the Colorado River at the Nevada-Arizona border created Lake Mead and supplies water to 25 million people, including in the cities of Las Vegas, Phoenix, Tucson, Los Angeles, and San Diego. We’ve explained in the past if Lake Mead drops to dangerously low levels, the entire...