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Explain the method scientists use to study how Earth’s atmosphere and climate have changed during the past million years.

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kyradiane
There are many methods used by the scientists to study the change of earth's atmosphere and climate over the past million years. The study is called paleoclimatology. Since there are no measurement tools during those era, it studies the past by using proxy data. Proxy data includes earth's sediments, tree rings, historical archives, ice cores, and etc.

bradleerclark2018

Scientists first collect ice cores from deep under the arctic and antarctic ice shelves. Next they measure the concentrations of gasses trapped in the ice to determine how long ago the ice was formed and what the composition of the atmosphere was like at the time. These ice cores are like little time capsules showing what Earth’s atmosphere and climate were like in the past