Trees tell of past climates: but are they speaking less clearly today?

Briffa KR, Schweingruber FH, Jones PD, Osborn TJ, Harris IC, Shiyatov SG, Vaganov EA & Grudd H
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Briffa, K. R., Schweingruber, F. H., Jones, P. D., Osborn, T. J., Harris, I. C., Shiyatov, S. G., … Grudd, H. (1998). Trees tell of past climates: but are they speaking less clearly today? Philosophical Transactions of the Royal Society B: Biological Sciences, 353(1365), 65-73. https://doi.org/10.1098/rstb.1998.0191