The US, like wealthy countries in general, has a fair share that is too large to be achieved domestically. Developing countries are generally in the opposite position, with climate action potentials greater than their fair shares. The opportunity is obvious – wealthy countries can do their fair shares by supporting developing countries as they seek levels of ambition greater than they could achieve on their own, levels that are actually commensurate with the 1.5°C temperature goal. This would not be charity, but rather the US fully meeting its fair share of a long-overdue, now emergency target.