Abstract
The relative contribution from GCR intensity variations and anthropogenic carbon dioxide emissions into the atmosphere (the Suess effect) to the variation of 14C isotope content in annual tree rings is considered. The contribution from a reduction in GCR intensity to the lowering of the cosmogenic 14C isotope content in tree rings from the middle of the 19th century to the middle of the 20th century is shown to be comparable to the contribution from the Suess effect.
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