News tagged with northern hemisphere

Earth's last warm phase exposed

Analysis of data collected from ice cores and marine sediment cores in both polar regions has given scientists a clearer picture of how the Earth's climate changed during the last Interglacial period. This ...

May 02, 2014 4.7 / 5 (15) 1

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

Tackling an Ice Age mystery

In the northern hemisphere, ice sheets ebb and flow in 100,000-year cycles, driven by varying amounts of sunlight falling on Earth's surface as its orbit and orientation toward the sun changes. But astronomical variations ...

Sep 05, 2013 4.8 / 5 (5) 0