A grim thought, but in 50 years time when a lot of the planet is uninhabitably hot, does that reduce emissions, by virtue of, you know, there not being people to stoke the fires?
[1] https://en.m.wikipedia.org/wiki/Clathrate_gun_hypothesis
but poor people dont consume as much energy as rich Westerners.
First, once the CO2 is in the atmosphere, it stays there for a very long time (centuries to millennia). So stopping emissions would not stop the heat.
Second, emissions also contain sulfer dioxide, which has a cooling effect through the formation of sulfate aerosols. These do not stay in the atmosphere for very long (only weeks). So in a scenario where these emissions stop, the immediate result would be a loss of that cooling effect and thus even more heat.
Food security is another quesiton.