the shift to a clean-energy economy can affect today’s poor and working class by a loss of jobs that are closely related to the oil-energy sector, destabilizing the working class. depending on how the shift it is going to be handled, there are a lot of consequences that are possible, similar to the previous shift in the economy, like loss of jobs, mass-migration to more prosperous places and the necessities to reinventing or simply going back to school to learn about the new skills required.
the shift probably would affect less-developed nations in major ways, and again, the consequences depend on how those things will be handled. It is possible, the less developed nation will have an expansion on their market in comparison to more-developed nations, becuase they can easily jump the stage of industralization based on oil and going directly to a clean energy based economy.