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Moscow's government, led by powerful and long-reigning Mayor Yuri Luzhkov, has indicated that clearing the capital's streets of snow is simply too expensive. Instead, officials are weighing a plan to seed the clouds with liquid nitrogen or dry ice to keep heavy snow from falling inside the city limits. Word of the proposal has sent a shudder through Moscow just as the first dark, snowy days have fallen on the capital. It has also piqued the surrounding region, which would receive the brunt of the displaced snowfall, and has raised concerns among ecologists. Seeding clouds to ensure good weather during holidays is a long-standing Russian practice. Slate has a nice explainer on the practice: loud seeders use a number of procedures. In the mid-1940s, three scientists at General Electric (including the novelist Kurt Vonnegut's brother Bernie) showed that by injecting dry ice into a cloud, you could freeze tiny droplets of water, which would in turn make it easier for other droplets to glom on and freeze as well. Later experiments showed that silver iodide—which has a crystal structure similar to that of ice—could also help, by forming "ice nuclei" upon which droplets might freeze.
This can be done using silver iodide flares, which are dropped 8 or 10 at a time from above the cloud, or with silver-iodide-filled rockets or anti-aircraft shells. If you're seeding clouds over a mountain, you can use generators on the ground which release silver iodide vapor into the air currents that rise up one side of the mountain and into the clouds.