

The loss in trust may be permanent, but I think there is still a real desire to develop new good relations. If the US were to pass meaningful reforms and approach old allies on a more equal footing in real negotiation and not primarily the role as the big bad bully, I think a new framework of trust could be slowly built again.
Joining the ICC and not threatening invasion if they dare try to hold an American accountable would be a good start.







https://en.wikipedia.org/wiki/Shockley–Queisser_limit
Tl:dr The max theoretical efficiency for a silicon solar cell is estimated to be 29.4% with real world high end modules topping out at 26.8%
26% in a lab is not the same as 26% in the field after 5 years, but it is nonetheless a good result.
Solar scales out well, so low conversion effiency isn’t really what determines whether an installation is feasible or not.
If you’re evaluating cheap 20% efficient panels vs expensive 25% efficiency panels, you need only scale up the area of cheap panels by 25% to match output. Plus, panels that start at a lower efficiency experience less derating over time, so the difference in performance diminishes as an installation ages.