text: The reduction in Arctic sea ice and increase in Antarctic sea ice has happened before and is called the polar see-saw or polar anomaly. (See Svensmarks attached paper.) The polar see-saw occurs during Dansgaard-Oscheger events (also called Bond events). It is now apparent the later 20th century warming was a Bond event. Gerald Bond found evidence of cosmogenic isotope changes at each of a long series of warming followed by cooling events (he has able to track 25 events through current interglacial Holocene and into the last glacial period, at which point he reached the limit of the range of the proxy analysis technique) which indicates a solar magnetic cycle change caused the warming followed by cooling cycle.