There's very little doubt C02 does increase the holding of heat. There's also very little doubt the earth has gotten slightly warmer over the past century.
Where I become skeptical is in the modeling and predictions. More heat means more evaporation means more cloud cover means less heat but clouds hold heat held in. The earth tilts slightly on it's axis. Energy output from the sun varies. There are so many interacting factors. "Butterfly effect" and all.
Then you throw politics and redistribution-ism and media sensationalism on top of it all and wow what a stinky mess.
Suffice it to say I personally don't think global catastrophe is imminent from C02. Not convinced at all. I lived through the ice age scare (here's Leonard Nimoy talking about it: https://www.youtube.com/watch?v=7tAYXQPWdC0) and the start of the global warming alarm in the late 80's (which just didn't pan out as many expected 30+ years later). So I don't trust the ability to model long term climate changes and present it in an objective and non political fashion.
But I do believe humans are affecting the climate and from caution we should reduce C02 as we reasonably can without starving millions to death. It's cleaner anyway and fossil fuels are just nasty in other respects and they are limited.
Am I an illiterate unscientific "denier"? An oil company shill? Nope. Just a guy who has seen nonsense hype cycles which this certainly resembles come and go.
I would assume there’s also a correlation between the “don’t do anything about climate change” folks and limited government/capitalist beliefs. All of those beliefs seem distinct but they all have aligned incentives to keep the economic status quo.
I’m not trying to be condescending towards that side either, I know it’s true for myself too. I generally support change that shifts power away from the powerful, so I was always going to support something like the green new deal over a privatized solution.
Edited for clarity