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Ice core samples storing mysteries from bygone eras. Genericprofilename

Explainer: what are ice cores?

Ice cores are cylinders of ice drilled from glaciers and ice sheets. When snow falls it takes with it a record of many aspects of the atmosphere. As long as no melting takes place, this information is…
By studying ice cores, researchers can measure the methane emissions from thousands of years earlier. Arabani/Flickr

Humans did affect the atmosphere - even before industrialisation

The past is the key to the future. When snow falls on polar ice sheets, in Greenland and Antarctica for example, air is trapped between the snowflakes. Year after year, the snow compacts under its own…

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