Global warming threat seen in fertile soil of northeastern U.S. forests

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Global warming threat seen in fertile soil of northeastern U.S. forests

Posted: 11 Jun 2012 04:37 PM PDT

Vast stores of carbon in U.S. forest soils could be released by rising global temperatures, according to a new study. Scientists found that heating soil in Wisconsin and North Carolina woodlands by 10 and 20 degrees increased the release of carbon dioxide by up to eight times. They showed for the first time that most carbon in topsoil is vulnerable to this warming effect.

New evidence supports theory of extraterrestrial impact

Posted: 11 Jun 2012 04:36 PM PDT

Scientists have discovered melt-glass material in a thin layer of sedimentary rock in Pennsylvania, South Carolina, and Syria. According to the researchers, the material — which dates back nearly 13,000 years — was formed at temperatures of 1,700 to 2,200 degrees Celsius (3,100 to 3,600 degrees Fahrenheit), and is the result of a cosmic body impacting Earth.

Humans are primary cause of global ocean warming over past 50 years

Posted: 11 Jun 2012 12:32 PM PDT

Scientists have shown that the observed ocean warming over the last 50 years is consistent with climate models only if the models include the impacts of observed increases in greenhouse gas during the 20th century.

More people, more environmental stress

Posted: 11 Jun 2012 09:25 AM PDT

Scientists have taken a critical look at the various factors that have long been prime climate-change suspects. One in particular: the role of population growth.
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