Another reason world leaders might support this is that they think the program would have a good result (namely by them thinking that their current goals would be the goals that would be landed on, namely because they might think their goals are right and that the program would land on the right goals or goals close to the right ones), and that that result would become even better with their participation.
Another reason world leaders might support this is that they think the program would have a good result (namely by them thinking that their current goals would be the goals that would be landed on, namely because they might think their goals are right and that the program would land on the right goals or goals close to the right ones), and that that result would become even better with their participation.