L ooking out to sea from the grey sandy beaches of Santa Marta, on Colombia’s Caribbean coast, it is never hard to spot evidence of the country’s thriving fossil fuel export trade. Oil tankers ride at anchor on the horizon, and sometimes, locals say, lumps of coal wash up on the shore, blown off the collier ships that carry cargos from the nearby mines. It was here, on Wednesday evening, that the Colombian government took a bold step to shift its economy – and that of the rest of the world – away from dependence on coal, gas and oil and into a new era of clean energy. With the first ever conference on “transitioning away from fossil fuels”, the host joined nearly 60 countries determined to loosen of the grip of petrostates on the world’s future. Colombia’s Irene Vélez Torres, left, greets the Dutch minister of climate and green growth, Stientje van Veldhoven.…