What is the fact around the exact impact that humanity has had vs natural conditions, and what is the derivative of that impact as the climate has changed? For

What is the fact around the exact impact that humanity has had vs natural conditions, and what is the derivative of that impact as the climate has changed? For there to be a runaway effect means that humanity is no longer the significant factor so how is this calculated? I've never found this explicitly stated anywhere. By the way, every human makes decisions based on what they "personally think". Please share the "actual truth values" if you have them.