Apologies, I should have been more specific in my retort;
For the record, and for the billionth time to the same endless moronic argument; yes it it has changed in the past, but over millennia, not over the short time spans we are experiencing now
without any definitive rationale.
Abrupt changes require a catalyst and when it comes to temperature shifts involved with periods such as the YD phase, this requires a catastrophic catalyst which is why the hypothesis' of massive failure of glacial ice dams or the more recent impact hypothesis are involved in that conversation. When people suggest the climate has always changed within the context of human interaction, it is implied that climate shift is natural thereby humans have no impact.
I agree that conversation should be civil however when it comes to discussing established science which is entirely predicated on the survival of our species and probably most others, I think pleasantries were exhausted a long time ago.
So yet again, it is utterly staggering that fully formed adults still argue that climate change is undecided