Global warming is a fact.. period.
What has caused it is the question.
Some think it is mankind and varied industries and all the emissions and pollution associated with them. To a limited degree , those may be minor contributing factors but a more thorough and honest review of the historical and geological record indicate otherwise as to what major driving force is behind global warming.
One need look no further than to the sky and the big behemoth of a sun which acts as a core heating element and heats the earth like an egg incubator is heated by heat lamps.
What the 'experts' fail to acknowledge is that global warming is part of a cosmic process that existed long before man ever walked the earth much less sought to harness its resources for its own advancement.
That bloviators weigh in as they do does little to diminish that fact. They contribute little more than hot air to the mix, imo.