@chjara
(Not trying to dispute AGW)
I notice that I'm confused: from my understanding we came out of an ice age ~15k years ago, with the Holocene glacial retreat.
But looking into this, there's also something called Dansgaard–Oeschger events, which look like they happen every ~4k years.
We also had the Little Ice Age 400-200 years ago, but that abruptly ended with the Industrial revolution, maybe you're claiming that it would've persisted if not for human intervention?