Global methane concentration hits 1,900 ppb
6th January 2022
The National Oceanic and Atmospheric Administration (NOAA) has published its latest data for atmospheric methane. This shows that globally, methane is now at its highest level in recorded history and has just passed the 1,900 parts per billion (ppb) milestone.
Although carbon dioxide's contribution to climate change is greater overall, methane is far more potent on a per molecule basis. The global warming potential of methane has been estimated at 70 to 100 over a 20-year period. That is, over a 20-year period, it traps 70 to 100 times more heat per mass unit than CO2.
NOAA's newly published data – based on air samples taken at dozens of sites around the world – confirms that global atmospheric methane in September 2021 (the latest available month) reached 1,900.5 ppb, the highest level in human history and probably the highest in at least the last 800,000 years. For comparison, methane in pre-industrial times tended to stay below 700 ppb. The jump between 2020 and 2021, a difference of nearly 16 ppb, is also the highest annual increase on record.
Methane accounts for about 20% of the greenhouse gases produced by human activities.
https://www.futuretimeline.net/blog/202 ... 900ppb.htm
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