A five-year, $8.8 million pilot project to examine whether seeding clouds with silver iodide produces a measurable increase in snowfall has started in the US. The test area is the skies over Wyoming’s Medicine Bow, Sierra Madre, and Wind River mountain ranges and involves intensive observations of Wyoming snow clouds. Scientists from the National Center for Atmospheric Research (NCAR) designed the experiment to evaluate a technique that has been mired in controversy for decades.

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