Transcript for scene 21 of the video " The Ice Age: 6-in-1 Flank" by Rolf Witzsche - Ice Age Ahead not Global Warming  

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Proxy is measured in Beryllium-10 isotope ratios

The other proxy is measured in Beryllium-10 isotope ratios. And the third proxy is measured in sunspot numbers.

Each of these proxies reflect the intensity of solar activity in historic time.


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Published by Cygni Communications Ltd. North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F. Witzsche