News tagged with northern hemisphere

Abrupt permafrost thaw increases climate threat

As the Arctic warms, greenhouse gases will be released from thawing permafrost faster and at significantly higher levels than previous estimates, according to survey results from 41 international scientists ...

Nov 30, 2011
4.4 / 5 (13) 6 | with audio podcast

When the Sahara turned to sand

The Sahara wasn't always a desert. Trees and grasslands dominated the landscape from roughly 10,000 years ago to 5,000 years ago. Then, abruptly, the climate changed, and north Africa began to dry out.

Nov 11, 2013
4.4 / 5 (12) 4

Study adds new clue to how last ice age ended

As the last ice age was ending, about 13,000 years ago, a final blast of cold hit Europe, and for a thousand years or more, it felt like the ice age had returned. But oddly, despite bitter cold winters in ...

Sep 08, 2010
4.4 / 5 (16) 5 | with audio podcast