Jeffrey Sachs — American Economist born on November 05, 1954,

Jeffrey David Sachs is an American economist and director of the Earth Institute at Columbia University. He is known as one of the world's leading experts on economic development and the fight against poverty... (wikipedia)

The idea that UN commitments should be followed by action is indeed a radical one, especially for the United States, where wilful neglect of its own commitments is the rule.
The great leaders of the second world war alliance, Franklin Roosevelt and Winston Churchill, understood the twin sides of destruction and salvation. Their war aims were not only to defeat fascism, but to create a world of shared prosperity.
The longer you wait, the less fun. If you wait until the bitter end, the whole economy can be destroyed.
In my view, there is an urgent need to communicate with the public and help to explain where there is consensus, and where are there doubts about the issues of sustainable development.
It's not so unusual to run out of someone else's currency.