On 20 September [through to September 27], at the request of the young people who have been staging school strikes around the world, we’re walking out of our workplaces and homes to spend the day demanding action on the climate crisis, the greatest existential threat that all of us face. It’s a one-day climate strike, if you will – and it will not be the last. This is going to be the beginning of a week of action all over the world. And we hope to make it a turning point in history.