People wave the flags of French trade union General Confederation of Labour (CGT) as they take part in a demonstration to protest against the pension overhauls, in Marseille, southern France, on December 5, 2019 as part of a national general strike. - Trains cancelled, schools closed: France scrambled to make contingency plans on for a huge strike against pension overhauls that poses one of the biggest challenges yet to French President's sweeping reform drive. (Photo by CLEMENT MAHOUDEAU / AFP) (Photo by CLEMENT MAHOUDEAU/AFP via Getty Images)