Some resorts have turned to artificial snow , produced by forcing water and pressurized air through a " snowcannon" to supplement natural snow.
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Snowcannons also need below-zero temperatures to operate, meaning they will not be a viable long-term solution if winter temperatures keep rising.
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An alpine resort saves 20-30% of energy when snow -making by stockpiling snow and using super-powered snowcannons, according to its president Georg Eisath.