With regular intervals mammoth mummies are discovered in the Siberian permafrost high north on the Arctic coast, for instance the Jarkov Mammoth the Fishhook mammoth and the
Yukagir Mammoth. All are dated between 18,500 and 20500 carbon years, roughly 23-24,000 years ago at the onset of the last glacial maximum when Greenland was oh some 10 degrees colder than today.
Extensive research has recvealed that the mammoths were part of a productive grassy steppe with horses, antilopes (Saiga), lions etc. And that less than 500 miles from the North Pole in the high arctic tundra that only supports a musk oxs.
Obviously, none of those simultaneous ice ages studies addresses this refuting evidence. If you can't explain this, you can't explain the ice ages, the very basis of the current global warming scare.