Climate change has been here for as long as Earth has been here. The sun’s cycles, changes to Earth’s ocean currents cause a rhythmic climate variation. The are also occasional natural events that approximate a nuclear winter due to massive clouds of dust being ejected into the upper atmosphere. Disasters such as large comet or asteroid strikes or eruptions of super-volcanoes can plunge the Earth into a sudden ice age.
That said, there is anthropogenic global warming going on today. We know CO2 is a greenhouse gas, trapping solar heat into the Earth’s atmosphere and causing warming. We know we are dumping far more CO2 into the atmosphere per year today than Earth’s natural processes can remove in a year. You sometimes see estimates of CO2’s atmospheric half-life, but those estimates are relative to levels being added, since once Earth’s absorption systems are maxed out, there is no more removal capacity. We are dumping 27 billion tonnes of CO2 into the atmosphere each year, or about 130 times as much as all Earth’s volcanoes contribute. But we’ve only recently started doing that and since the industrial revolution, CO2 concentrations in the atmosphere have been steadily rising.
The CO2 levels were much higher in the distant past. Ocean levels were 350 feet higher than they are today. But do we want to teraform Earth to make it suitable for dinosaurs and to flood all the coastal regions of the planet up to the coastal mountains? I don’t think so. I agree with your conclusion that humans are causing atmospheric CO2 to rise with no end in sight, and that this isn’t a good idea.