I'm so surprised that my country Finland 🇫🇮 is no 1, since it's a cold country. We have a very short summer for growing crops. I think the reason for this high ranking is more about politics, than climate zones. We have endured several wars in the 1900s (lessons learned) and are neighboring Russia, which is not so trustworthy. Last spring Sweden was in contact with Finnnish companies because they needed more meat. We have a higher level of self-sustainability.