The letter says: “We know that high inequality undermines all our social and environmental goals. It corrodes our politics, destroys trust, hamstrings our collective economic prosperity and weakens multilateralism. We also know that without a sharp reduction in inequality, the twin goals of ending poverty and preventing climate breakdown will be in clear conflict.”
I guess instead of going backwards we need to swerve to the side somehow.
We could attempt a more complicated maneuver as I have seen described once in a magazine in the library: a somersault.