Yes, climate has “always changed.”
We have seen swings that ranged from “sauna” to “deep freeze,” and we’re aware that many factors seem to have generated those swings … orbital mechanics … solar physics … massive volcanic eruptions on scales we can only vaguely imagine … celestial object strikes, are among those factors.
300 million years ago Earth sequestered TRILLIONS of tons of carbon, took it out of the atmosphere, out of the oceans, out of the climate system. Virtually ALL of these wide swings we know about happened with that carbon sequestered … out of the atmosphere, the oceans, the systems that generate Earth’s climate.
In a literal blink of a geological eye we have developed technologies to extract and burn those trillions of tons of hydrocarbons to recover the energy stored there and we have swiftly employed those technologies. We have been pouring that carbon, that previously sequestered carbon, that carbon that has been locked away for hundreds of millions of years, that carbon that has been out of the atmosphere, out of the oceans, out of the mechanics, chemistry and physics of the climate into a system we do not yet fully understand.
It seems to me that even if this currently observable climate change is one of those “normal” cycles, we have released material into the system that very likely has the effect of potentiating the process, exaggerating the amplitude.
We are pouring gasoline on a fire started by lightning.