Comfort Or reducing their standard of living. Remember for most people in the world this they will keep consuming to get to *a* standard and will not care until they get there. One can say that the average person in a sub saharan african country X consumes 1/10th or 1/50th of the carbon that an american does. But unless N generations of X don't rise well above the poverty line they will continue to emit and it will add up by 2100 or 2200.
You don't even have to go to sub saharan africa. I believe there is non negligible double digit percentage of this country that is on the "edge" when it comes to many important living factors like Health, Education and Childcare Cost. Any of which when breached make one not care about reducing consumption.