I agree that climate change should be our main concern. The real existential risk of AI is that it will cause millions of people to not have work or be underemployed, greatly multiplying the already huge lower class. With that many people unable to take care of themselves and their family, it will make conditions ripe for all of the bad parts of humanity to take over unless we have a major shift away from the current model of capitalism. AI would be the initial spark that starts this but it will be human behavior that dooms (or elevates) humans as a result.
The AI apocalypse won’t look like Terminator, it will look like the collapse of an empire and it will happen everywhere that there isn’t sufficient social and political change all at once.