Column: China digs deep to raise coal output to record high
China's coal production has surged this year as the government seeks to improve energy security by reducing dependence on imports and amassing inventories at power plants.
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### Instruction: Column: China digs deep to raise coal output to record high

### Response: China's coal production has surged this year as the government seeks to improve energy security by reducing dependence on imports and amassing inventories at power plants.