Oh that really depends. In most countries the 'knowledge' is widespread. This is less so in the USA, the only country in the world where, to my knowledge, ignorance is often considered a virtue. Even if the 'knowledge' is widespread and readily available said 'knowledge' is often resisted for either ideological or financial reasons. There is a huge industry devoted to that, once more centered in the USA. You will make little progress arguing against a mind steeped in conspiratorial fantasies because everything you might say is merely one more brick in the giant wall of their imaginary conspiracy.

Then there are those who profit and profit mightily from the actions that lead to global warming. They may partake of the delusions, but often they don't. If they don't they look at a couple of salient facts. One is that they profit at an astronomical magnitude from the. actions that lead to the warming. Of course. The other is that whatever unpleasant consequences may result will almost certainly be born by others. I see little reason to disparage their reasoning in this. They are pretty well certainly right. The other opinion they hold is that the end result will NOT be some sort of total civilizational collapse but rather a gradual demeaning of life and an increasing brutality. A brutality in which they will remain on top and suffer little compared to others. However many Chicken Littles may predict the grand apocalypse they are probably right in this as well. Civilization will NOT collapse, but it will degrade to a state hardly worthy of the name, a state where they will still be sitting pretty thank you very much.

So... looking at the world in toto and even in its backward parts such as the USA you are probably right that 'knowledge' isn't the critical barrier. This doesn't mean that people should cease the steady drumbeat of factual information. That remains a necessity. What is lacking is a will, a determination to recognize and overcome the resistance of those who profit from the problem AND those, with all the good will in the world, who will only go half way, a quarter way, a tenth of the way to challenging and hopefully removing the giant impediment embodied in the economic and political power of those who make a living/killing from business as usual.

There are thousands of battles being fought every day that challenge the power of authority, and every one of them is a battlefield where the situation of humanity in a warming world is being fought out. As we speak tens of thousands of farmers are still impeding the daily business of Delhi in opposition to 'reforms' that are meant to increase the already malignant power of agribusiness. This IS a climate fight and one much more important than a hundred petitions to government or thousands of hours spent working to elect 'good guys' who will make the inevitable and fatal compromises. The issue comes down to power and who holds it, ordinary people or an elite, whatever the paper thin ideological clothing said elite may use as 'proof' of its good will and ability.