Humans have caused 1.5 °C of long-term global warming according to new estimates

That being said, it's a difficult topic to discuss rationally. Part of the issue is deciding on what your baseline is. Looking at the last 200 years tells a pretty limited view. Consider around 100,000 years ago when global temperatures were similar [1].

That raises some questions about what caused that spike but, more importantly, what caused it to lower. You can say "an ice age" but what really triggers an ice age?

My point here is that doomsday predictions of Venus-like runaway inflation I think are both unrealistic and unhelpful in actually motivating people about an otherwise very real problem. We really have no idea of the mechanics in place.

But like I say, we're going to do absolutely nothing about it anyway.

[1]: https://www.pbs.org/newshour/science/analysis-is-it-actually...

What use it is to ponder about what has triggered an ice age in the past, when that mechanism can’t possibly counteract what’s happening now?

It’s like thinking about starting blood pressure medication when you’re having a heart attack right now.

> There are twenty-five of these distinct warming-cooling oscillations (Dansgaard 1984) which are now commonly referred to as Dansgaard-Oeschger cycles, or D-O cycles. One of the most surprising findings was that the shifts from cold stadials to the warm interstadial intervals occurred in a matter of decades, with air temperatures over Greenland rapidly warming 8 to 15°C (Huber et al. 2006). Furthermore, the cooling occurred much more gradually, giving these events a saw-tooth shape in climate records from most of the Northern Hemisphere (Figure 1).

The last time I brought this up, someone said (paraphrased) "that's only over Greenland". Yeah, the place they did measurements. Do you really think a change in air temperature of 8-15C over decades is repeatedly localized in just one place?

[1]: https://www.nature.com/scitable/knowledge/library/abrupt-cli...