Three quarters of Utah's population lives around the Great Salt Lake, a region that continues to be one of the fastest-growing areas of the country.  That rapid growth, along with the climate crisis, has increased pressure on a lake that has already skrunk by two-thirds, creating an "environmental nuclear bomb."    The danger of dropping water levels isn't just about the ecosystem and migratory birds depending on it or the availability of water to the surrounding community - though these are both serious concerns. The lake bed also has high levels of arsenic that will become exposed to wind as it dries up, creating toxic dust pollution.