Right. How can it be “proof” if very few, or possibly none, have the expertise to put all the pieces together and draw/defend a conclusion? Re-read Spencer’s quote and ask yourself: If this is the case, why are we being told we’re headed toward catastrophe with such certainty?
Ultimately, there is someone — a group of people, actually — who take on the job of speaking for the climate science “field”: the politicians and acitvists who issue the reports. That’s why you won’t find the word “science” in the IPCC acronym, but you will find the word “government.” Ask yourself: Is that congruent with the claim GW orthodoxy is indisputable science put forth by a scientific consensus beyond questioning?