Wow, who ever would have guessed?
“Do they actually mean that the earth goes through cycles or trends from warm to cold and then back again?
Wow, who ever would have guessed?”
You forget that the Earth’s climate depends on an extremely delicate balance that can be upset by the slightest disturbance to the natural order.
The climate is full of positive feedback dangers that can trigger perpetual drought, heat, cold or you name it.
Sarcasm off..
It is a proven fact that the positive feedback mechanisms don’t dominate the climate on the Earth. This is shown by the evidence that none of the extreme events of the past triggered irreversible runaway effects. CO2 levels 10 times the current concentration didn’t trigger irreversible global warming. Huge areas of glaciation didn’t cause runaway cooling either.
Negative feedback mechanisms must dominate the climate system since, so far, it has been very resilient to perturbations like solar flares, comet impacts and huge volcanic eruptions.