Ever wondered just how scientists work out what past climates were like. One way is through studying ice cores, but looking at changes over more recent time can be carried out through dendrochronology - a posh term for tree ing analysis. Experts from around the world have arrived in Exeter (Sep 26th 2008) to find out how tree rings and pollen can provide vital clues about climate change.
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http://news.bbc.co.uk/1/hi/england/7638714.stm
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