The unequivocal statement is actually that the temperature is increasing. The planet has warmed. That's unequivocal because that's an observational fact.
The attribution to human cause is a slightly more complex thing, and that involves the combination of observations we have and the models we have that allow us to dive into the reason for the change and to ask, “For the emissions we have observed in the past and the changes in concentrations of greenhouse gases we have also observed, do the models produce a temperature response that is like the temperature response that we observe?” If the answer to that question is yes, then we can attribute the change in temperature to human activities; and that is the case. The statement there is that, with very high confidence, the warming we've seen over the last 50 years is attributable to human activities.