signal, and that they appear to correlate to events in the previous Camp Century core 1,400 km away, thus providing evidence for their corresponding to widespread climatic anomalies (with only the Camp Century core, they could have been local fluctuations). Dansgaard et al. speculate that these may be related to quasi-stationary modes of the atmosphere-ocean system. D-O events tend to be what drives the "Sahara pump" which has had an effect upon human evolution and dispersal. The cyclicity is also found during the Holocene, where the events are referred to as Bond events. See also Younger Dryas References External links History of climate variability and change Pleistocene Paleoclimatology Last Glacial Period 20th century in science