The preboreal oscillation (PBO) was a short cooling period within the preboreal stage of the Holocene epoch. == Definition == Based on evidence from pollen, early Holocene cooling periods have been discovered already from the 1960s on.
The preboreal oscillation (PBO) was a short cooling period within the preboreal stage of the Holocene epoch. == Definition == Based on evidence from pollen, early Holocene cooling periods have been discovered already from the 1960s on.
Source: Wikipedia "Preboreal oscillation" · CC BY-SA 4.0
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