The question you should ask for policy purposes is how much the temperature would rise in response to different possible increases in CO2. It’s basically a matter of estimating a continuous parameter that nobody thinks is zero and whose space of possible values has no natural dividing line between “yes” and “no”. Attribution of past warming partly overlaps with the “how much” question and partly just distracts from it. That said, I would just read the relevant sections of the latest IPCC report.
The question you should ask for policy purposes is how much the temperature would rise in response to different possible increases in CO2. It’s basically a matter of estimating a continuous parameter that nobody thinks is zero and whose space of possible values has no natural dividing line between “yes” and “no”. Attribution of past warming partly overlaps with the “how much” question and partly just distracts from it. That said, I would just read the relevant sections of the latest IPCC report.