Teen activist Greta Thunberg spent the Easter weekend in the UK and joined Extinction Rebellion protesters in London. She also took part in a Guardian Live event and told audiences that the world was facing an 'existential crisis'. The big test on this will come on 2 May, when the Committee on Climate Change announces the results of a review of the UK’s targets, including when the country should aim to reach net zero emissions



The Greta Thunberg effect: at last, MPs focus on climate change