The poles are swapping ans this causes glaciation. It will take place in the next 100-400 years but we don't know when, and it's the reason that airport runway compass headings, get repaired every two years - magnetic north is changing. The CBC documentary is the best lay press explanation of this phenomenon.

Earths engine, whose spin creates our magnetic field



Cosmic rays (as a function of megnetosphere strength) have a large if not overwhelming effect on climate. These papers explore that.