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Inter-annual δ 13 C values of α-cellulose in two Chinese pine trees (Pinus tabulaeformis Carr.) exhibit a long-term decline of more than 2‰ for the period of 1896 to 1990 AD. This decline is much larger than the decrease in atmospheric δ 13 C caused by industrialization since 1850 AD. Here we present evidence that long-term trends of 13 C/ 12 C in tree rings also reflect...
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