We have 150 years of temperature records to base our assumptions on, which for a planet that is 4.5 billion years old, a statistical sampling so miniscule as to be utterly laughable. I personally think that the behavior of the sun is the most important component in climate change, but also admit that I haven't a clue as to the scientific method required to arrive at the truth of what I think. It is UNKNOWABLE!
Why can't humans be humble enough to realize that there are many things, in our known universe, that we can't predict or control? To know how the atmosphere of a planet is going to behave in the near future and predict with certainty what this will do to human life is nothing short of arrogant hubris pure and simple. I refuse to scare little children with this nonsense.
It is kinda like trying to describe what God looks like or as Shakespeare so penetratingly wrote 400 years ago:
But man, proud man,
Drest in a little brief authority,
Most ignorant of what he's most assured,
His glassy essence, like an angry ape,
Plays such fantastic tricks before high heaven
As make the angels weep.