Climate Change Working Group

The average carbon dioxide reading surpassed 400 parts per million at the research facility atop the Mauna Loa volcano on the island of Hawaii for the 24 hours that ended at 8 p.m. on Thursday.  Chris Stewart/Associated Press

nytimes.com - by Justin Gillis - May 10, 2013

The level of the most important heat-trapping gas in the atmosphere, carbon dioxide, has passed a long-feared milestone, scientists reported Friday, reaching a concentration not seen on the earth for millions of years.

Scientific instruments showed that the gas had reached an average daily level above 400 parts per million — just an odometer moment in one sense, but also a sobering reminder that decades of efforts to bring human-produced emissions under control are faltering.

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National Oceanic and Atmospheric Administration (NOAA) monitoring program
http://www.esrl.noaa.gov/gmd/ccgg/trends/weekly.html

Corn in the hands of a farmworker in South Africa. Photograph: Greatstock Photographic Library/Alamy

guardian.co.uk - by John Vidal - April 13, 2013

Millions of people could become destitute in Africa and Asia as staple foods more than double in price by 2050 as a result of extreme temperatures, floods and droughts that will transform the way the world farms.

As food experts gather at two major conferences to discuss how to feed the nine billion people expected to be alive in 2050, leading scientists have told the Observer that food insecurity risks turning parts of Africa into permanent disaster areas. Rising temperatures will also have a drastic effect on access to basic foodstuffs, with potentially dire consequences for the poor.

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US National Climate Assessment
http://assessment.globalchange.gov/what-we-do/assessment/draft-report-information

submitted by Stella Tarnay

securityandsustainabilityforum.org - by Kristina Byrne - January 31, 2013

                            (LINKS TO STUDY ABSTRACT AND ADDITIONAL INFORMATION ARE BELOW)

Scientists look at an ice core from the West Antarctic Ice Sheet Divide coring site.  Credit: Thomas Bauska, OSU

CNN - by Ben Brumfield - March 8, 2013

Global warming has propelled Earth's climate from one of its coldest decades since the last ice age to one of its hottest -- in just one century.

A heat spike like this has never happened before, at least not in the last 11,300 years, said climatologist Shaun Marcott, who worked on a new study on global temperatures going back that far.

"If any period in time had a sustained temperature change similar to what we have today, we would have certainly seen that in our record," he said.

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Study Abstract - A Reconstruction of Regional and Global Temperature for the Past 11,300 Years
http://www.sciencemag.org/content/339/6124/1198.abstract