If it wasn't for the 'Atlantic Conveyor' also known as the Gulf Stream, we would have the same climate as Siberia. If you learnt about convection currents in physics at school you will know how it works.
Global warming could turn it off.
Another climate factor which may affect us is 'Pole Reversal'
When North Becomes South: New Clues to Earth's Magnetic Flip-Flops
When (note not
If) that happens it will be pot luck for everybody as to what climate they end up with.
PS that is if you survive the catostrophic natural disasters that go with it
