BBC News By Olivia Le Poidevin image copyrightGetty Images image captionIn 2019 Ellie Goulding urged young people to choose hope in the climate change battle at the One Young World summit in London. Four hundred women - including a host of female stars - have signed an open letter to the UK government calling for more women in "decision-making roles" at a global climate summit next year. One woman has so far been appointed to the UK's four-person leadership team for the UN's COP26 summit, in Glasgow. A letter, signed by actress Emma Watson and singer Ellie Goulding, says the gender balance was "incomprehensible".