“During the largest of the natural rises, carbon dioxide increased by about 14 parts per million in 55 years.”
The largest natural CO2 jump in 50,000 years of Antarctic ice took 55 years and lined up with the Heinrich Events of the last ice age. Humans now add the same 14 ppm in 5 to 6 years. That is 10 times the fastest rate the planet managed on its own, and those natural spikes came about once every 7,000 years.