Earlier quoted context omitted.
Technology can't save you from famines when there isn't enough sunlight to grow crops for a season or two. One good supervolcano and civilization might collapse or at least take such a hit as to be utterly transformed. Billions dead, etc.
Literally grow lights and nuclear reactors? (Or plain old gas turbine generators) Technology is the only thing that can save anyone from that type of situation. Prayer sure wouldn’t help!
Billions would perish. If the luckier rich countries did not get nuked or invaded by armies or waves of endless starving refugees then they would be able to save a good amount of their population. At best world development goes back ~50-100 years. At worst, modern civilization basically ends from the combination of conflict and famine.