in 2300 ? … the worst global warming scenario does not say what happens after global population has collapsed.

SCENARIO (for 2300) PROJECTED GLOBAL WARMING (°C) CO2 CONCENTRATIONS (PPMV)
RCP2.6 0.0 to 1.2 360
RCP8.5 3.0 to 12.6 2000

i like the book series “Foundation” by Isaac Asimov where he describes rebuilding after collapse.