Before orbital forcing was accepted as the principal natural driver of glacial cycles there was a theory that they were driven by an internal oscillation - warming of the oceans leads to greater snowfall at high latitudes leads to growth of icesheets leads to increased albedo leads to atmospheric cooling leads to cooling of the oceans leads to less snowfall leads to retreat of icesheets leads to decreased albedo leads to atmospheric warming leads to warming of the oceans, and round the cycle again.

I was taught this as a hypothesis in the early '70s.

As I recall, in the '90s there was concern about global warming kicking off a Scandinavian icesheet. But the climate has warmed too much for snow accumulation in Scandinavia.