Dating for skeptics

’s free newsletters."data-newsletterpromo-image="https://static.scientificamerican.com/sciam/cache/file/458BF87F-514B-44EE-B87F5D531772CF83_source.png"data-newsletterpromo-button-text="Sign Up"data-newsletterpromo-button-link="https:// origincode=2018_sciam_Article Promo_Newsletter Sign Up"name="article Body" itemprop="article Body" Scientists can study Earth’s climate as far back as 800,000 years by drilling core samples from deep underneath the ice sheets of Greenland and Antarctica.

Snowpack becomes progressively denser from the surface down to around 100 meters, where it forms solid ice.Scientists use air trapped in the ice to determine the CO2 levels of past climates, whereas they use the ice itself to determine temperature.But because air diffuses rapidly through the ice pack, those air bubbles are younger than the ice surrounding them.The researchers then compared results from multiple locations to reduce the margin of error.“Our method takes into account more data and shows that the age difference in Antarctic temperature and CO2 levels is less than we previously thought,” Parrenin says.

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