Central Arizona Project invested $ 1 million to research cloud seeding . The project is funded by the U.S. Department of Energy and NASA, but it's not a government agency. Some scientists are concerned about silver building up in river basins . There are also legal uncertainties over who should get additional water .
Central Arizona Project invested $ 1 million to research cloud seeding . Process involves seeding clouds over the Rockies with silver iodide . Some scientists are concerned about silver building up in river basins . There are also legal uncertainties over who should get additional water .