Terrawatch: the adventurous icebergs that trigger ice ages

3rd Feb, 2021

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Adélie penguins stand on an iceberg in the Southern Ocean, Antarctica. Photograph: Jeff Miller/Getty Images


How does an ice age start? We know that changes in the Earth’s orbit around the sun alter the amount of solar energy reaching our planet, but it has long been a mystery as to how this triggers such a dramatic change in the climate. A study shows that Antarctic icebergs may be responsible for tipping the balance.

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