Both 12K year cycles and the fact that the last ice age ended about 11,500 years ago are pretty well-accepted positions. In fact, this was a central aspect of the "global cooling" scare of the 1970s.

Long term, most of the climate change alarmism going on about the next century is alarmism that just so happens to align with a lot of left-wing political goals at the same time.

While conservation of hydrocarbons is something we should shoot for regardless, the simple fact is that humanity has to technology it's way out of any number of climate challenges in the centuries to come, and developing that tech should be the top priority over 98% of the current performative and virtue signaling behavior over AGW.