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‘Energy independent’ Uruguay runs on 100% renewables for four straight months
(theprogressplaybook.com)
This is a most excellent place for technology news and articles.
Vatican City /s
I think that there are constraints for certain countries, but the majority probably could. And when they can't, it should be solved by cooperation and trade, IMHO.
Then maybe those countries shouldn't exist.
Though that's based solely on your example.