News tagged with northern hemisphere

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
4.5 / 5 (13) 4

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

The paradox of polar ice sheet formation solved

The beginning of the last glacial period was characterized in the Northern hemisphere by major accumulation of snow at high latitudes and the formation of a huge polar ice sheet. For climatologists this was ...

Sep 01, 2013
4.4 / 5 (13) 0 | with audio podcast

NASA study finds Earth's lakes are warming

(PhysOrg.com) -- In the first comprehensive global survey of temperature trends in major lakes, NASA researchers determined Earth's largest lakes have warmed during the past 25 years in response to climate ...

Nov 23, 2010
3.8 / 5 (14) 3 | with audio podcast

Arctic sea ice larger than US melted this year

(AP)—An area of Arctic sea ice bigger than the United States melted this year, according the U.N. weather agency, which said the dramatic decline illustrates that climate change is happening "before our eyes."

Nov 28, 2012
4.1 / 5 (13) 49

Tempest-from-hell seen on Saturn

(PhysOrg.com) -- Scientists analyzing data from NASA's Cassini spacecraft now have the first-ever, up-close details of a Saturn storm that is eight times the surface area of Earth.

Jul 06, 2011
5 / 5 (10) 7 | with audio podcast

What's baking on Saturn's moon Titan?

(Phys.org)—Radar images from NASA's Cassini spacecraft reveal some new curiosities on the surface of Saturn's mysterious moon Titan, including a nearly circular feature that resembles a giant hot cross ...

Oct 16, 2012
5 / 5 (10) 1 | with audio podcast