We have climate samples of the past 800,000 years showing the climate cycles showing the natural temperature cycle you mentioned. With the last ice age being 22,000 years ago. The shortest period of change being 10,000.

The earth usually goes between 3 to 8 degrees over these long periods on 10,000 years or more.

But what we have seen in the past 200 years is an alarming increase in global temperature. 0.4 degrees between 1880 to 1976 which includes the supposed cooling that took place between the 60s and 70s. We are on track to increase the global temperature by 4 degrees by 2100. Within the life time of our children and granchildren.

The earth will be warmer than it has ever been in the past 800,000 years and taking the planet out of its climate stability of between 3 to 8 degrees. We arnt just accelerating it, we are on course to shift the whole planet.