I think there's a difference in what people consider "bad" - millions or billions dying from disaster or their regions becoming uninhabitable isn't the extinction the human race, but for me it's at the threshold of "bad" that I'd like to do something about it. Am I worried about all the human race being eradicated? No, we're cockroaches. But I'd rather untold numbers don't have to suffer.

When this thread started it was about existential threats. Few people would argue that ten degrees celsius isn't likely to be a huge disaster.

For the record, I didn't down vote you (I don't even have enough HN cool-points to do so).

I was responding more to the callous nature of your comment than whether or not current warming trends are an absolute existential threat.