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Treetop climate research. Close-up of an apparatus designed to sample and analyse gases emitted by the leaves of the surrounding oak trees. This research is aimed at studying the effects of climate change on these trees. The oak trees are downy oaks (Quercus pubescens). This is the Oak Observatory (O3HP) at the Observatoire de Haute Provence, Haute Provence, France. Photographed in June 2012.
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