That's right, Humans have increased atmospheric CO2 AT LEAST 100 times

"We have caused the same changes over 100 years."

Yes and here is how we have done it.

Keep in mind that it has been known since 1859 that CO2 warms the atmosphere.

Here is a brief history of major changes in atmospheric CO2 over the past 450,000 years.

Notice how long it took to change by roughly 100ppm each time, from natural causes.

Then look at the last line and how fast it is. That's what humans have done.

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450,000years ago, it was at ~200ppm and it took ~50,000 years to go to ~ 280ppm.

It was at ~280ppm 400,000 years ago and it took 50,000 years to go down to 190ppm.(Ice age)

It was at ~190ppm 350,000 years ago and it took 25,000 years to go up to 300ppm.

It was at ~300ppm 325,000 years ago and it took 74,000 years to go down to ~180ppm.(Ice age)

It was at ~180ppm 260,000 years ago and it took 20,000 years to go up to ~300ppm.

It was at ~300ppm 240,000 years ago and it took 20,000 years to go down to ~200ppm.(Ice age)

It was at ~200ppm 220,000 years ago and it took 20,000 years to go up to ~260ppm.

It was at ~260ppm 200,000 years ago and it took 60,000 years to go down to ~180ppm.(Ice age)

It was at ~180ppm 140,000 years ago and it took 15,000 years to go up to ~290ppm.

It was at ~290ppm 125,000 years ago and it took 100,000 years to go down to 180ppm.(Ice age)

It was at ~180ppm 25,000 years ago and it took 24,800 years to go up to ~280ppm.

It was at ~280ppm 200 years ago and it took 180 years to go up to 400ppm, today.

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That's right, Humans have increased atmospheric CO2 AT LEAST 100 times faster than the fastest that nature has done it in the last 450,000 years - at least.

For 800,000 years atmospheric CO2 was between 170ppm-300ppm. It's now 400ppm, 33% higher than at any time in at least the last 8,000 centuries.