If global warming reaches or exceeds two degrees Celsius by 2100, University of Western Ontario's Joshua Pearce says it is likely that mainly richer humans will be responsible for the death of roughly one billion mainly poorer humans over the next century.
The carbon budget for 2°C AGW (roughly 10^12 tonnes carbon) will indirectly cause roughly 10^9 future premature deaths (10% of projected maximum global population), spread over one to two centuries.