A quarter of carbon emissions come from mining, but that isn't the industry's only environmental challenge... TWO HUNDRED metres below the surface of the Colombian Andes, a row of pews face a gigantic illuminated cross carved into the rock. The Zipaquira Salt Cathedral is one of the country's most striking tourist destinations. Constructed in the 1950s in the site of a former salt mine, it draws tens of thousands of pilgrims every year. As the faithful visit the former mine for the forgiveness of their sins, is there a lesson to be learned for miners elsewhere?
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