Transcript for scene 26 of the video " Ice Age 2050s: Certainty 1" by Rolf Witzsche  

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From the 1990s onward

All of this means that humanity's ice age science hadn't had any hard and fast physical data to work with prior to 1990 when the big ice-drilling projects began and the Ulysses satellite was launched. The development of this data, from the 1990s onward, renders the Ice Age science a fairly new discipline, as all prior assumptions were built on just vague evidence or mere conjecture.

 

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