In terms of 'greenhouse gasses' water vapor is the most crucial. The dispute is actually about whether there is a positive or negative feedback loop. Evidence is piling up that those who panic about a positive feedback loop are wrong. Unfortunately, politics has damaged science to the extent that it will be difficult to understand if there is a threat here which is worth the (devastating) sacrifices needed to address it. I lay the blame for this almost completely on the 'warmunista' side of the battle.
This is what is so absurd about the whole thing, the original theory has been proven objectively incorrect, yet the theory continues as a mass delusion.
The global warming theory was predicated on a "if A, then B, then C" hypothesis,
where B never happened. The original (and still current) theory is increases in CO2, increase water vapor, which in turn warms the atmosphere. But water vapor did not change in any manner predicted or needed for the theory to work. Thus the theory is wrong, QED. But I'm called the anti-science denier (often in racist terms).
As with everything, it is a scam for a narrow set of politically connected people (i.e. climate "scientists" and the green industry) to extract money from the public through the government. That is all it is.
Take away the free government money (enabled by the dollar) and the scams stop, or at least decrease significantly.