you don't need a study. most of the population of canada is situated far further south than most americans understand. the lowest point of ontario, for example, is south of the most northern point of california.

most of the inhabited areas of canada already have very hot summers. in southern ontario you can expect weather like washington DC in july

if most of the united states is set to be victimized by climate change (which everyone accepts) then it is a trivial deduction that most of the population of canada will also be