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July 12 2013

Worm poo's window into past climate


Earthworm faeces can be used to measure past temperatures, providing a window into the ancient climate.

A study shows that the chemistry of small balls of chalky crystals secreted into soil by the worms varies with temperature.

A UK team said the granules could be compared with other climatic "proxies", such as ice cores and deep sea sediments.

Details appear in the journal Geochimica et Cosmochimica Acta.

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