The normal 12 ice age cycles we have had are from plants absorbing so much CO2 that the planet cools, kills the plants, the plants rot, the CO2 is returned, and the planet warms back up.
But these normal cycles are 110,000 years long.
Instead we have doubled the CO2 concentration in the atmosphere, in less than 50 years.
That is many thousands of times faster.
And the last ice age was just melted off by the hottest natural warming part of the cycle, only about 15k years ago.
That means by doubling the CO2 artificially, we essentially are adding a new artificial warming on top of the already warmest part o the natural cycle.
That is an unprecedented double warming.
We have no idea what the result of this double warming will be, because it has never happened before.
It is very likely we will have such warming as to kill all life on the planet.
Venus has global warming from sulfites instead of carbon, but its temperature from global warming is over 400 degrees, so global warming is a serious threat to all life.