Paris accord hasn't been around for long enough to see if it'll actually produce meaningful results. Kyoto Protocol was around longer, and would you call it a success? If it was, then why have a Paris accord? The examples you have listed are things where the benefits are pretty immediate, not a couple of generations away.

To get to the level of co-operation needed, a significant investment needs to made in educating people of all mindsets, about the benefits of this co-operation. That itself is going to take a couple of generations.