Sasha Sagan, the daughter of the brilliant scientist Carl Sagan (he died in 1996), relates in “For Small Creatures Such As We: Rituals and Reflections for Finding Wonder” that her father used to tell her ” that air particles stay in our atmosphere for such a long time that we breathe the same air as the people who lived thousands of years ago.” That sense of continuity of generations, the binding straight line, is what drives me to pursue the survival prospects of Cranes and to join Extinction Rebellion. As Sasha Sagan puts it: ” The air you’re breathing right now, this second, involuntarily, automatically, it’s not just the old air of Jesus and Muhammad and Cleopatra, but also the new air of future generations.”