Environmental activists are on the news a lot, but are they making a real difference? We'll show you whether the law, supports their cause. She's the climate superstar, but what has Greta Thunberg actually achieved? You'll find more videos about international law on our website: https://www.bbc.co.uk/learningenglish/business-english #COP26 #bbclearningenglish #environment #globalwarming #climatechange