David: the USA pledged $3 Billion dollars to the climate fund and even if we paid that amount (which was not mandatory) it would certainly not amount to “most of the cost, or almost all of it”. I believed the Paris accord was a poor deal and I would have revised the USA contribution level and I would have attempted to convert much of our contributions from cash into US produced products that would then be provided to developing nations. At least that way our money would put Americans to work and help strengthen our place in the global marketplace for things like solar panels, wind turbines, etc. Instead we backed out and left our set at the table to someone else to fill. Not a good move IMO.