Climate change is 100% natural 100% of the time, and yet it has resulted in the series of replacement cultures and civilizations in Europe (including the British Isles), the Middle East, Asia, and even the Americas. That isn't trivial, nor am I a moron.
And when was that giant volcanic eruption in Iceland, with the ash cloud that kept the northern hemisphere in the dark for 18 months, dropped temperatures drastically and led to mass crop failure /starvation? I think it was mid-6th century. More volcanic eruptions followed, then the bubonic plague: like about 50 million dead.
Volcanoes --> huge cloud cover --->crop failures ---> mass human die-off.
Yes, climate change. And all of it natural.