KarenC, help me out here.
We've just barely begun to understand how climate works
&
No one really knows what's going to happen because no one really knows enough about the Earth's climate to make accurate predictions.
but yet
The possibility of severe and catastrophic climate changes is real enough that we need to act NOW!
I don't see how you can say this. If we don't know enough to understand something entirely, the what do you suppose we do? Don't we risk further damaging this system by acting if we don't know what we are doing.
The road to hell is paved with good intentions.