Yes...we can talk about climate change ( a naturally occurring event over the millennia...) ...there will be water shortages in decades to come, making it more expensive than oil.....due to population increase.....but right now my perception is that the greatest threat to the world and to the economies of that world is WHEN (not if...) China invades Taiwan.

There is a lot of history to that island....but it is well summarised here:
https://www.express.co.uk/comment/ex...-3rd-world-war