Loading...

And before the Holocene, during the Ice Age, scientifically known as the last glacial period, the Sierra Nevada glaciers would have been bigger, peaking around 30,000 years ago. And humans are confirmed to have been living in North America as early as 23,000 years ago. Some archaeological evidence, and this is controversial, puts people in Northwestern New Mexico around 30,000 years ago. But either way, it's unlikely that humans ever set eyes on the ice-free Sierra Nevada. And the reconstructed glacial history indicates that a future glacial-free Sierra Nevada is unprecedented in human history. And that's a quote from the author of the study.