I’ve read about about experiment like this while learning game theory. Simple Tit-for-Tat stratetgy (play what your opponent played last turn) won 3 tournaments straight. It auto-enables cooperation, (almost) whatever is your opp’s strategy and if they want to exploit you—well, they can’t.
You may need to think how to initialize to cooperate with yourself.
My main point is that we/our children will heavily feel those 2 extra degrees Celsium agreed on in Paris. But thanks for pointing out that my sources on this are skimpy.