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“When I found an old ‘fish finder’ printout from a 1980s trip to Lake Mead, it sparked a meditation on our Valley’s diminishing water supply. The fish finder, as it happened, also monitored the lake bottom. And guess what: Many of our old fishing holes are now above ground! So it’s hard not to wonder when we’ll bottom out. ‘Global weirding’ has drastically reduced snow pack in the Rockies, and with it the capacity of our great survival resource, the Colorado River. Makes the Lake Mead I remember seem impossibly distant—and unfathomably deep.”