for scene 23 of the video " Ice Age 2050s: Certainty 1" by Rolf Witzsche
here for a larger image
The year 1990 was the pivotal year
Most of the hard evidence that we have of the previous ice ages, is relatively recent. Almost all of it didn't exist prior to 1990. The great research efforts and resulting discoveries began around 1990.
The year 1990 was the pivotal year when the scientific ventures related to the ice ages were beginning to bear fruit. The big ice core drilling projects, both in Antarctica and in Greenland, were launched in the 1990s, and in some cases slightly before.
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Published by Cygni Communications Ltd.
North Vancouver, BC, Canada - (C) in public domain - producer Rolf A. F.