Question

People living in cold climates build houses with sloping roofs

Answer 1

Explanation:

slanting roof (especially a steep one, for an UNHEATED and UNINSULATED attic space) prevents the snow from accumulating. Ideally, this allows the snow to blow away before it accumulates - or (sometimes) slide off. (Snow slides off a metal roof a LOT more easily than a shingle roof.)

The unheated part is also important - because if the attic is warm, then meltwater will flow down the surface of the roof - to the eves where it will freeze again and build an ice dam, which will also create a berm where snow can accumulate.

And if you insulate an attic, then some dam fool is going to try and use it for habitable space.