American Geophysical Union

Elevated carbon dioxide making arid regions greener

Scientists have long suspected that a flourishing of green foliage around the globe, observed since the early 1980s in satellite data, springs at least in part from the increasing concentration of carbon dioxide in Earth's ...

May 31, 2013
4.9 / 5 (17) 6

Distinguishing drought and water scarcity

Water resources can become strained by both natural factors such as drought and by human factors such as unsustainable use. Water resource managers can develop practices to reduce overuse of water resources, but they cannot ...

Mar 15, 2013
4 / 5 (1) 0

African dust forms red soils in Bermuda

In Bermuda, red iron-rich clayey soil horizons overlying gray carbonate rocks are visually stunning topographical features. These red soils, called terra rossa, are storehouses of information not only on past local processes ...

Sep 20, 2012
not rated yet 0

In the Greek isles, a volcano has awakened

In 1650 B.C.E., a series of massive volcanic eruptions decimated the ancient seafaring Minoan civilization. Over the next 4 millennia, the largely subaquatic Santorini caldera had a series of smaller eruptions, with five ...

Apr 23, 2012
5 / 5 (5) 0

Reforestation efforts reshape Hawaii's soil hydrology

Starting with the arrival of Polynesian settlers in the fourth century, and peaking in the mid-1800s, the destructive forces of wildfires and pests and the grazing of feral pigs, goats, and cattle reduced the native forests ...

Mar 31, 2012
5 / 5 (3) 0

Oil sands pollution comparable to a large power plant

It takes a lot of energy to extract heavy, viscous and valuable bitumen from Canada's oil sands and refine it into crude oil. Companies mine some of the sands with multi-story excavators, separate out the bitumen, and process ...

Feb 22, 2012
5 / 5 (4) 1