We're totally working on fusion technology, and it's coming along at a nice pace. Every now and then we beat previous thresholds for how much energy it's generating.

In terms of "working together", that would indeed be idea. Just look at what the EU does for energy infrastructure across all the EU countries. Imagine if we gave the UN the mandate and funding to do that, but for the world. Just through economies of scale we'd have a much, much more efficient electricity system.

Unfortunately at this point the realist in my comes out and it becomes easy to pick that apart by what would really happen if we tried. "My country should get more and if you don't do x we'll pull funding!"