It's true there really isn't any proof we have done all of it or how much is from cO2 as to more general urbanization/deforestation; but that should be left to theoretical science and could take hundreds of years to figure out. In meantime does it hurt to make the assumption we are the factor pushing climate over edge and start to prepare methods to deal with it?

I have no idea. That requires policy, economics, decision analysis, and (probably) more convincing evidence that we are near an edge.

Again, I think the climate is changing. And I think it will continue to change in ways that adversely affect humanity.