For decades, a column of smoke had poured from deep within the gigantic sawdust heap. Water had failed to seep into the smouldering recesses far below. Several environmentalists stood by the smoking column puzzling how to rid the world of this unwelcome source of greenhouse gases.

Arnold arrived carrying two cans of petrol. He uncapped both cans and, after taking a deep breath, disappeared into the densest fumes. A minute later, two empty cans came hurtling from the smoke, The greenies fled in fear.

Arnold emerged, seated himself on an upturned can, and watched the enormous smoke column slowly disappear.

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