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Variations in the Earth's orbit and inclination are major factors to past climate changes. Because land surfaces are sensitive to changes in insolation, whereas more land mass is in the northern hemisphere, it was thought insolation changes in the northern hemisphere were more important to long-term climate change. However, a new study of Antarctic ice cores shows that temperature fluctuations can be explained by climate changes in the southern hemisphere as well. Knowledge about times in the distant past helps us to understand climate dynamics. [Source: EurekaAlert!]
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