Did you read the article?

Current models don’t assume carbon capture technologies to remove CO2 from the atmosphere, they assume interactions with the oceans to remove CO2 from the atmosphere.

And yes, 3C will be devastating, but not doing anything will be more devastating, that’s also what the article says. If all lower goals are out of reach we should still aim for 3C because 3C is a lot better than 4C. Saying a certain temperature is devastating is not a useful comment in a scenario where that is the only good option left.

We fucked up, now we must act based on the current situation.

There are a lot more than two countries in Oceania