We don’t need a time machine to learn from the past (but let us know if you find one)! Air bubbles trapped in ice for millennia and ancient pollen grains can tell us a lot about climate shifts hundreds of thousands of years ago!
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Sources:
https://www.amnh.org/exhibitions/climate-change/changing-atmosphere/what-s-an-ice-core/
https://www.amnh.org/exhibitions/climate-change/changing-atmosphere/the-ups-and-downs-of-co2
https://www.researchgate.net/publication/284275913_Pronounced_variations_in_Fagus_grandifolia_abundances_in_the_Great_Lakes_region_during_the_Holocene
https://sites.nd.edu/paleonproject/synthesizing-fire-history-records-to-understand-fire-regime-variability-across-alaska/
https://sites.nd.edu/paleonproject/oak-trees-and-climate-in-the-midwest/
https://www.newscientist.com/article/dn16892-natural-mechanism-for-medieval-warming-discovered/
https://phys.org/news/2017-07-carbon-dioxide-world-water-wise.html
Images:
https://en.wikipedia.org/wiki/File:Palais_de_la_Decouverte_Tyrannosaurus_rex_p1050042.jpg
https://en.wikipedia.org/wiki/File:Sediment_in_the_Gulf_of_Mexico_(2)_edit.jpg
https://en.wikipedia.org/wiki/File:Picea_glauca_taiga.jpg
https://commons.wikimedia.org/wiki/File:Beech_growth_rings.jpg
https://en.wikipedia.org/wiki/File:Opening_and_Closing_of_Stoma.svg
https://en.wikipedia.org/wiki/File:GISP2_1855m_ice_core_layers.png
https://commons.wikimedia.org/wiki/File:Core_samples.jpg
https://en.wikipedia.org/wiki/File:Null_point_theory_image1.png
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