The science journal Nature reports that land in the world’s coastal cities is subsiding while also losing ground to rising sea levels. But it’s been discovered that the trend is also impacting places without expansive shorelines and with largely dry terrain, including Arizona. Geological surveys show more than 3,000 square miles in the state experiencing subsidence, increasingly in urban areas. Subsidence can be stopped or slowed, but not reversed, says Edward Kavazanjian, a professor in the School of Sustainable Engineering and the Built Environment. The best remedy may be to quit pumping groundwater, Kavazanjian says, but that would mean facing a big challenge to find new sources of water,  including extensive water recycling.