Andrés Olarte, the whistleblower who has shared the company's data, says pollution by the firm dates back many years. He joined Ecopetrol in 2017 and started working as an adviser to the CEO. He says ...

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The company's main refinery is in Barrancabermeja, 260km (162 miles) north of the Colombian capital Bogota. The huge cluster of processing plants, industrial chimneys and storage tanks stretches ...