Climate

A human shadow is seen on a dried out field after drought in Germany. Photograph: Patrick Pleul/EPA

guardian.co.uk - by Fiona Harvey - May 19, 2013

Some of the most extreme predictions of global warming are unlikely to materialise, new scientific research has suggested, but the world is still likely to be in for a temperature rise of double that regarded as safe.

The researchers said warming was most likely to reach about 4C above pre-industrial levels if the past decade's readings were taken into account.

That would still lead to catastrophe across large swaths of the Earth, causing droughts, storms, floods and heatwaves, and drastic effects on agricultural productivity leading to secondary effects such as mass migration.

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Study - Energy budget constraints on climate response
http://www.nature.com/ngeo/journal/v6/n6/full/ngeo1836.html

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