Carbon Dioxide Levels Topped 400 PPM Throughout Northern Hemisphere In April, WMO Says

[G_j]

http://www.huffingtonpost.com/2014/05/26/carbon-dioxide-levels_n_5391858.html

Reuters
Posted: 05/26/2014 12:08 pm EDT Updated: 05/26/2014 12:59 pm EDT

By Tom Miles

GENEVA, May 26 (Reuters) - Carbon dioxide levels throughout the northern hemisphere hit 400 parts per million (ppm) for the first time in human history in April, an ominous threshold for climate change, the World Meteorological Organization said on Monday.

The 400 ppm level in the atmosphere, up 40 percent since wide use of fossil fuels began with the Industrial Revolution, is rapidly spreading southwards. First recorded in 2012 in the Arctic, it has since become the norm for the Arctic spring.

The WMO expects the global annual average carbon dioxide concentration to be above 400 ppm in 2015 or 2016. Rising concentrations of the heat-trapping gas raise risks of more heatwaves, droughts and rising sea levels.

"Time is running out," WMO Secretary-General Michel Jarraud said in a statement.

"This should serve as yet another wake-up call about the constantly rising levels of greenhouse gases which are driving climate change. If we are to preserve our planet for future generations, we need urgent action to curb new emissions of these heat-trapping gases."

Almost 200 governments have agreed to work out a deal by the end of 2015 to slow climate change as part of efforts to limit the average temperature increase to two degrees Celsius (3.6 degrees Fahrenheit) above pre-industrial times.

Temperatures have already risen about 0.8C (1.4F).


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