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Up and down and up and down, you see the massive changes in the Silurian ages, between the Carboniferous and Permian ages? Then the Tertiary period the temperatures began to drop to the modern age where ups and downs have been relatively smaller and quite consistent. Even before the Tertiary age things were getting more stable, the Cretaceous era seemed to be a little stable, then temperatures rose and then dropped down further.
CO2 levels have been dropping for quite a long time, until human advancement too. CO2 levels have been stable for hundreds of thousands of years, after this slow and steady drop.
No doubt a lot of this is a decrease in the number of volcanoes, perhaps plate tectonics slowing down or being so extreme. The Earth is possibly entering a far more stable era. Unless humans change it all, of course.
CO2 levels dropped largely because the Ice Ages bound up all the Natural carbon exchange between ocean, land and atmosphere. And nothing much was LIVING during that period. CO2 is largely an indicator of LIFE on the planet. Since it's part of the combustion system of every living thing..
And therefore the point that was being made is that the Earth is now more stable. Would you agree with this?
Would you also agree that human interference threatens this stability?
Actually no. I couldn't agree to that. And I'm not dissing you for believing that. But on a timescale that matters to climate -- this planet has been oscillating in and out of MAJOR glacial periods in just it's RECENT history. And the warm times are CONSIDERABLY shorter than the cold times. FOUR TIMES in recent past history. So the odds are -- it's by every scientific and engineering definition in an unstable state. BUT --- maybe this oscillation is what's left of the more violent and magnified extremes that existed in it's early development. So in a sense -- it's MATURED -- but I wouldn't bet there isn't gonna be a fairly regular 5th or 6th Ice Age in the future.
The last four hundred and fifty thousand years have been pertty regular in their oscillations. View attachment 53134
Our interglacial is about over if it is not already as each time we flip into glacial phase we have a peak spike. The spatial resolution of 500 year plots cant show the real levels of CO2 at the time of spike but the temperatures spikes are well documented. The spike on the end of this graph is really a point out of context.
Our current CO2 spike is most likely normal cyclical response and natural variation. from the empirical evidence this has all happened before many times.
FunTime's almost over if you read that chart literally. The spike at the end is WAAAY out of context because ice cores on that scale will NEVER have enough resolution to show 60 or 100 years blips in temperature. I GUARANTEE other interglacial optimums had temperatures similar to ours at one time or the other.
There are two ends. Which end are you talking about?