In the long term, most countries on earth will not be able to function as they are now if they don't switch to alternative energy sources.

This will involve a mix of wind, solar, hydro, geothermal and nuclear on grids that span continents with massive battery stores to balance supply with demand. Between climate change and petroleum-fuelled kleptocrats, ditching fossil fuels is a necessity, not a choice. And the long term here is on the order of decades, not centuries, so within most of our our lifetimes.