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A miner manually culls rocks and stones from coal in Cucunuba, Cundinamarca Department, Colombia, on Saturday, July, 29, 2017. Colombia is set to produce a record of more than 90 million tons of the fossil fuel this year, its biggest export after oil. Colombia continues to bet on coal, even as global demand tapers off because the world is switching to cleaner fuels. Photographer: Nicolo Filippo Rosso/Bloomberg via Getty Images

A miner manually culls rocks and stones from coal in Cucunuba, Cundinamarca Department, Colombia, on Saturday, July, 29, 2017. Colombia is set to produce a record of more than 90 million tons of the fossil fuel this year, its biggest export after oil. Colombia continues to bet on coal, even as global demand tapers off because the world is switching to cleaner fuels. Photographer: Nicolo Filippo Rosso/Bloomberg via Getty Images