I agree with you that much green electricity is of dubious benefit. Several UK companies charge the same for green as for normal, which suggests they have plenty of generating capacity and that if you move to green, someone else will get non-green. You just shuffle the book-keeping. Those that charge extra generally have more than the minimum % of green generation.

Developing countries are going to want to reach the level of developed countries. If we can adopt a lower level of CO2 emission, then they will aim for that level rather than our current level. TEchnology transfer will be important.