Food... or fresh/unpolluted water. For food, I think it's a little easier but societies that have a hard time producing would have to adjust what they eat and how they eat it. Also, less meat, less red wine, more beer and more potatoes. The latter are much more sustainable.
E.g., In Canada, we'll have to accept we can't have bananas, pineapple, kiwis, mangos any time. We'll have to stick to locally grown apples, way fewer (but higher quality) blueberries and probably eat all the things Icelanders eat like smoked fish.
There's a course on Coursera called The Nordic Diet which is about Scandinavia as a whole adjusting its national diet to eat more local produce. Talk about foresight! That's just one of the principles at least. It's a Danish-run program. E.g., They eat more lingonberries since they grow all over the place?
E.g., In Canada, we'll have to accept we can't have bananas, pineapple, kiwis, mangos any time. We'll have to stick to locally grown apples, way fewer (but higher quality) blueberries and probably eat all the things Icelanders eat like smoked fish.
There's a course on Coursera called The Nordic Diet which is about Scandinavia as a whole adjusting its national diet to eat more local produce. Talk about foresight! That's just one of the principles at least. It's a Danish-run program. E.g., They eat more lingonberries since they grow all over the place?