Climatologists are working off a 17th century cartoon version for
cyclical seasonal changes,to be specific ,it is a variation in axial
tilt to the Sun/orbital plane or a hemispherical Earth concept -

http://www.diduknow.info/sun/images/high_low_sun.gif

As cyclical climate variations straddle the Equator and vary in climate
bands towards the poles in a genuine mechanism for the cause of
cyclical seasonal changes,the sight of watching men dither around with
careless conceptions makes it difficult for the rest of humanity to
appreceate what is actually happening.

The bands straddling the Equator would become wider towards the poles
thus moving the temperate bands much higher in Latitude and
subsequently the disapperance of glaciers howerver all this is
meaningless when climatologists are still stuck with 17th century
astronomical conceptions and the methods behind that reasoning.