Northern European trees show a progressively diminishing response to increasing atmospheric carbon dioxide concentrations

This article appears in the special issue "Isotopes in Quaternary Paleoenvironmental Reconstruction", which emerged from a 2002 meeting on “Isotopes in Quaternary Palaeoenvironmental reconstruction” (ISOPAL) that was one of a series of PAGES sponsored workshops contributing to the Pole–Equator–Pole (PEP III) transect.