Obsessive carbon-counting climbs to an adrenaline-soaked peak on the University of Oxford’s trillionth tonne counter. With admirably few words, the university’s Department of Physics has used a short series of panic-inducing counters to indicate the imminent collapse of the world as we know it. Of course, demonstrating that the changes needed to avoid catastrophe can be positive, and that we could all be better off than ever before, is the trillion dollar challenge.