The last year (2015), for the first time in the recent history of man, for a whole month the carbon dioxide exceeded 400 parts per million in the atmosphere, ie 400 molecules of CO2 per million air molecules.
A record that 2016 blows away: according to the World Meteorological Organization's annual Greenhouse Gas Bulletin 2016 will, most likely, the first year during which this value will be
exceeded for 12 consecutive months.
And this despite the fact that in 2014 and 2015 carbon dioxide emissions produced by man remained constant. was in a position between the end of 2015 and early 2016, however, El Niño, which was particularly violent, has meant that we have had very intense drought conditions in extensive tropical regions, so that the reduced vegetation absorb a minor amount of carbon dioxide. Among other conditions were such as to allow the development of gigantic fires both in forest areas that forest.
EVER SO TO 3 MILLION YEARS. This framework, as a whole, has meant that the carbon dioxide has reached levels that exceeded the average of the last 10 years.
The value of 400 ppm was, as always, measured by air monitoring station in Hawaii on Mauna Loa, one of the most remote areas of any direct influence of human activities. According to data available to experts, the last time that carbon dioxide has remained consistently above the 400 parts per million occurred between 3 and 5 million years ago. In modern times, before 1800, the carbon dioxide in the atmosphere was 280 parts per million.
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