I like it. One way to do this is to create a personal consumption budget based on what a normal life would look like if the resources were equally shared and everything was done in a sustainable way. The rich would have to come down many steps of the ladder (and pretty much everybody reading this would be classified as rich) and the poor would be able to go up a bit. I don't think it could be done with 8 billion people though, but doing the math on this is super complex and probably would be years worth of work.