A Geological Perspective of Polar Bears

By David Middleton – Re-Blogged From WUWT

A Popular Narrative

Polar bears (Ursus maritimus) are the poster child for the impacts of climate change on species, and justifiably so. To date, global warming has been most pronounced in the Arctic, and this trend is projected to continue. There are suggestions that before mid-century we could have a nearly ice-free Arctic in the summer. This increases the urgency with which we must act to reduce our greenhouse gas emissions to delay or avoid some of the worst consequences of climate change.

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First Peoples: The Warming Alarm-Dog That Didn’t Bark

By Alec Rawls – Re-Blogged From http://www.WattsUpWithThat.com

Beneficial climate change allowed modern humans to emigrate out of Africa and spread around the globe says the new PBS documentary “First Peoples,” but it fails to mention that the era it designates as “good times” was several degrees warmer than today.

A critical moment in human history is intoned with intense drama (21:08-21:52 here):

The movement of prehistoric people was affected by the climate, which fluctuated over thousands of years.

I turned up the volume, knowing that if there was anything a warming alarm-dog could find to bark about, it was about to be featured front and center.

In bad times the Sahara was an un-crossable barrier, but in good times, when the climate was wet, the desert disappeared. Any adaption that emerged in one part of Africa could spread to other parts of the continent….

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