Millions of people - overwhelmingly children and teenagers – have taken to the streets around the globe, calling on their governments to take serious action to tackle climate change. Subscribe to our channel here: goo.gl/31Q53F The climate strike rallies have been led by schoolchildren and was sparked by campaigner Greta Thunberg - the Swedish teenager who inspired a global climate movement with her solitary protests last year. Protesters across continents waved placards and chanted slogans in what could be the biggest ever demonstration over global warming caused by humans. Gabriel Gatehouse reports. In the studio Katie Razzall is joined by former UN climate chief Christiana Figueres and the UK Student Climate Network's Lola Fayokun. #ClimateStrike #GlobalClimateStrike Newsnight is the BBC's flagship news and current affairs TV programme - with analysis, debate, exclusives, and robust interviews. Website: www.bbc.co.uk/newsnight Twitter: twitter.com/BBCNewsnight Facebook: www.facebook.com/bbcnewsnight