Climate change deniers often ask "How can you possibly know what happened 10,000 years ago?". Paleoclimatology is a fascinating field of study that gives us insights into the past, in order to help us model the future.

https://serc.carleton.edu/microbelife/topics/proxies/paleoclimate.html#:~:text=Paleoclimatology%20is%20the%20study%20of,serve%20as%20useful%20climate%20proxies.
https://www.giss.nasa.gov/research/briefs/1999_schmidt_01/
https://web.archive.org/web/20171204232348/http://www.whoi.edu/instruments/viewInstrument.do?id=8087
http://www.worldviewofglobalwarming.org/pages/paleoclimate.php
https://www.youtube.com/watch?v=dC_2WXyORGA

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