Can studying trees be helpful in providing information about climate from the past? If so, then how?

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Scientists have always studied trees to learn about the changes in geography, but nowadays they are looking at the rings in the tree to determine something else. They are examining the width of the rings so they can make an estimate about the temperature patterns. If they see large rings,...

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Scientists have always studied trees to learn about the changes in geography, but nowadays they are looking at the rings in the tree to determine something else. They are examining the width of the rings so they can make an estimate about the temperature patterns. If they see large rings, they know that the tree grew more in one season which means summer temperatures were higher than usual. They are also analyzing carbon and oxygen isotopes. They take a sample of the tree ring and then measure the isotope levels, which also yields data on weather patterns in the past.

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