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> There’s obviously no data going back 1200 years Historical period. Rome, Egypt, Mayans wrote everything related with taxes and management, including every ba
by pvaldes 5y ago
> There’s obviously no data going back 1200 years
Historical period. Rome, Egypt, Mayans wrote everything related with taxes and management, including every bad year for agriculture or origin of raw matters. Several 2000 to 4000 Yo documents are available.
12300 years back register: https://en.wikipedia.org/wiki/Dendrochronology https://en.wikipedia.org/wiki/Dendrochronology
45000 years back fauna catalogue: https://en.wikipedia.org/wiki/Cave_painting https://en.wikipedia.org/wiki/Cave_painting
800000 years back register: https://en.wikipedia.org/wiki/Ice_core https://en.wikipedia.org/wiki/Ice_core
And to look backwards further there is the fossil register, including some species so similar than extant ones that we can have a good clues about the climate where they grow, because they are still among us.
- LinuxBender 5y agoIce cores are interesting. I've given that a bit of thought and what I can't get past is the possibility that the cores show stored CO2 but not CO2 in the air at the time. This was also brought up in a couple PBS space time episodes and a documentary I can't recall the name of. Basically the storage of CO2 is not always related to the CO2 in the atmosphere and there are so many contributing and confounding factors that it is really hard to correlate with certainty. It is entirely possible that there have been brief periods (sub 1k years) that had large spikes of C02 that are not represented by the ice core and sea floor samples. I am not suggesting that core samples are invalid, rather that we may be missing some variables. I am certainly no expert on this topic.