They can get air bubbles trapped in ice cores. They can date the ice cores very very accurately.
Can they really? By what standard and by what means? The “standards” of course meaning the artifically determined “standards” that were created to substantiate a predetermined hypothesis...........
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Of course, you’re right. I am assuming that the guys who actually do the measurements are not corrupt to the bone. Rather, the guys who spin their numbers are corrupt.
That said, paleo climatologists have NEVER confirmed what AGM people say. People who study climate from thousands and millions of years ago have always showed that climate always changed radically and often rapidly. Further, their graphs have always showed that changes in heat have always— and I mean always— preceded changes in CO2 levels. That means that when the world warms up CO2 levels increase. Not the other way around...which is what the AGM people want you to believe.
(Why is this. There is a post above that points to it. When the world warms the oceans release more C02.)
What actually causes the warming comes from somewhere else.
These day people point to the sun and also from time to time —volcanic eruptions...and even more infrequently...cosmic events. Likely the last really big cosmic event was something that caused they younger dryas 12k years ago.
Duh!, ya think?
People who do that pointing are the idiot deniers........../sarc