| ironmanDX said: Over 100,000 years ago? I wonder what caused it then? Obviously we are having an impact but I think there are certainly other factors at play. |
The issue stems from the rate of change that we are experiencing.
Prior climatic changes in Earths history tended to occur over longer time scales, thus allowing for flora and fauna to adapt to the changing conditions or thrive in specific geographical areas.
That isn't occurring this time around, we are able to count the rate of change on decade-long time scales rather than millenia-long time scales.
For example the last time we had global warming of 5-7'C, that took about 5,000 years.
The current rate of change is occurring 10-20x faster than what has occurred historically.
https://earthobservatory.nasa.gov/features/GlobalWarming/page3.php
We are currently at 400~ ppm of CO2.
At about 1,000-1,500 ppm of CO2 we start to feel drowsiness. - We should hit that in the next 100~ years. (Frequently experience this level of CO2 as it's a normal environment when dealing with structural firefighting and confined spaces, some individuals will feel the effects sooner, especially with compromised breathing already.)
At 2,000 ppm we start to get headaches, sleepiness, poor concentration, increased heartrate, nausia and more.
It is also resulting in a mass extinction on an unprecedented level.
https://astrobiology.nasa.gov/news/timeline-of-a-mass-extinction/
| ironmanDX said: We don't really know how quickly it happened in the past though, do we? I'd like to read more into it actually. |
Yes we do.
Sience is pretty empirical on this point actually.
www.youtube.com/@Pemalite
