Growing vegetables in extreme cold

Israel’s Energy Industry Ltd. has developed a system that injects hot water into fine tubes to distribute heat over wide surfaces for large greenhouses. It has been sold to the government of Georgia where temperatures drop to minus 30 degrees Celsius.
http://jewishbusinessnews.com/2013/11/18/israeli-development-will-assist-to-maintain-agriculture-in-extreme-weather-conditions/

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