Better windows certainly have a better ROI, but they do not get you to replacing fossil fuels. Nuclear or solar/wind + battery does. Nuclear fortunately works

Better windows certainly have a better ROI, but they do not get you to replacing fossil fuels. Nuclear or solar/wind + battery does. Nuclear fortunately works everywhere and does not require batteries. It does, however, take engineering skill in order to build and operate, whereas a solar panel can be ordered from China rather cheaply. In the future, I guarantee you that China will mass produce small, safe, relatively idiot-proof nuclear plants and export them all over the world in Belt and Road version 2.0. They will bring in an all Chinese labor force to build it and quite possibly also to operate it or at least provide immediate support. Many of the people angry at China for not making meaningful CO2 commitments will praise them for saving the planet. As the West continues to de-skill and dumb down, we may even need them to come to the U.S. and generate reliable power for us.