...by living off their fat reserves when the farms stop sending food?
Farms would not stop sending food. People (HN readers are at least in the top income half (1) globally) would pay more money to buy food. Food is an essential commodity and I don't think an apocalypse is going to occur due to climate change.
tl;dr food is going to cost more and HN readers can afford that while poor people might not be able to afford it
(1) I think it's more like top 10%.
I hope that the timescales are such that drastic effects won't happen this century and give humans more time to adjust/come up with technology to mitigate the effects.
2c warming by end of the century would be terrible, 10c disastrous