If you ever wondered why we are able to make predictions about what past temperatures and climates were like before we were alive then you should check out the link below about proxy records. It outlines 4 major proxy records that we use in tree rings, ice cores, ocean and lake sediments, and corals. Each of these have their own unique use in telling the story of past climates and this website gives a good description of why we use each. It also gives an explanation of what a proxy record is at the start, and is a good initial point to start if you want to learn more.
My personal favorite are ice cores, check it out HERE
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