An anonymous reader writes "China is reportedly now using 4 drones to spy on polluting industries, according to The Guardian. The unmanned aircraft can cover 70 sqkm during a two hour flight. According to the state-run China Daily newspaper the drones have helped the ministry 'resolve' over 200 environment-linked cases. The Ministry of Environmental Protection claims that it can tell the type of smokestacks to crack down upon from the color of the smoke."
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