Somebody cracks RSA, which is a standard inscription
If this was done in a public domain way, the entire banking system and ATMs would stop working and could not be used, as they would be insecure. The whole thing is based on one inscription algorithm.
The internet collapses and cannot be restarted
The internet is the nervous system of the global economy, so if it goes down we have a really big problem.
Climate change, rapid changes, our current models
Low probability events often appear to be extremely likely, because they keep happening. So, for example, a large part of the Arctic ice breaks off and sea levels rise, maybe there is a drought and a severe heatwave that jeopar...