Carbon dioxide levels in southern hemisphere exceed 400ppm for first time

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Thursday, May 19, 2016

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The 10th Annual Greenhouse Gas Index of the National Oceanic and Atmospheric Administration (NOAA) published on Wednesday May 18, 2016 has stated that during the past 25 years, as a result of human activity,the direct warming effect in the atmosphere of carbon dioxide has increased by 50 percent above pre-industrial levels.

This comes as measurements taken by the Commonwealth Scientific and Industrial Research Organization (CSIRO) together with Bureau of Meteorology of Australia has shown that for the first time the level of carbon-dioxide in the atmosphere of the southern hemisphere has been recorded as rising above the 400 parts per million (ppm) indicator. The Cape Grim recording station located in Tasmania, Australia recorded the level exceeding 400ppm on May 10 with confirmation coming from Casey Station in Antarctica which recorded a level exceeding 400ppm on Saturday. Paul Krummel, Research Group Leader CSIRO, anticipates that these levels will not fall back below 400ppm for many decades.

The CSIRO noted that in the northern hemisphere carbon-dioxide levels in the atmosphere are already above 400ppm indicator. At present though the level falls back below the 400ppm level, particularly in Spring, due to the northern hemisphere’s large seasonal variations.

According to the CSIRO the concern with the level of carbon dioxide in the atmosphere is not that is has exceeded 400ppm but that it increases approximately 3ppm a year and could lead to an increase in global temperatures. World Meteorological Organization (WMO) Secretary-General Petteri Taalas said “This should serve as yet another wake-up call to governments about the need to take urgent action to make the cuts in CO2 emissions necessary to keep global temperature rises to well below 2 degrees celsius.”


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