Yes, you're right. People like to present the Earth being in trouble due to climate change, but the reality is that species have come and gone for billions of years. What we are really worried about is ourselves.
And that isn't a bad thing! All animals want to survive, it's not like we are being selfish for wanting to keep on living in reasonable comfort.
There are some problems, though. One of them is the lie that in order to do something, as a species, to combat climate change we must give up our comforts.
Another lie is the idea that plants are some kind of oxygen factory that'll just produce more oxygen the more carbon dioxide there is in the air. Yeah, to a point having more carbon dioxide is beneficial to plants, but they don't just consume more because there is more. If you are in a more oxygen rich environment, you'll still expel the majority of the oxygen you inhale, but if you are in a low oxygen environment, like on a mountain, you need to breathe more heavily.
So when carbon dioxide levels are low, sure plants want more of it, but there is a limit to how much they'll process in a given time.