Protests against climate change have become a regular Friday fixture. They started after Swedish teenager Greta Thunberg staged her school strike in August last year. The protests have now grown into a global phenomenon.The latest round of protests come in the week that the UN issued a stark warning about melting ice and the long term threat to the oceans. It was also the week that Greta lambasted world leaders for inaction that she described as "stealing her childhood".READ | 'How dare you?' - angry Greta Thunberg asks world leaders at UNThe overall impact of the Fridays for Future movement is still unknown.