[wmf]

The world is much richer overall and food production per capita is probably much higher. The world is much better connected, both in information (winter is coming!) and flow of goods. There would be far less hunger, although in a capitalist world people on the margin would still get squeezed.

Also, a few years of cooling might counteract global warming a little, although this would probably end up just giving more fuel to the "keep calm and burn coal" camp. Not much point in installing solar panels when the sky is dark.

[Nomentatus]

Flow of goods can also spread the pain, no region is spared. Reliable agriculture with better efficiency means overproduction doesn't happen as much, so there's less cushion. Rome was better at shipping cheaply than previous societies, and better integrated, so it suffered much more widespread (although less frequent) famines that could affect nearly the whole empire.