Extraction from one of the world's largest natural gas fields will end in October, the Dutch government announced Friday, turning off a lucrative source of revenue that also sparked unrest by causing a string of earthquakes. Faced with mounting anger from residents whose homes were repeatedly rattled by the shallow tremors, the government had already wound down extraction from the field which held 2,800 billion cubic meters of gas. Only enough is now being pumped to keep gas installations in the region operational.