Because, you know, carbon dioxide IS the major driver of climate change, am I right?

New Thinking on When the Arctic Froze | LiveScience

With the evidence that scientists currently have, it is clear that carbon dioxide levels were too high for Arctic ice to have formed at the same time as Antarctic ice, but the levels dipped down below the needed threshold about 23 million years ago, meaning that Arctic ice could have first formed 20 million years earlier than expected, the authors said.