Atmospheric methane increased two and a half times with industrialization and then leveled off at year 2000.
Since 2003 it has been on the rise again, but this time scientists say increased emissions are from the surface of the planet — a carbon feedback due to global warming. In the Arctic (Barrow Alaska) where methane is the highest the level has reached 1900 ppb (see right).
The atmospheric methane has never been higher than 800 ppb over the past 800,000 years
The methane increase started first inthe Northern hemisphere (2003) and the SH methane increased after 2006. The increase is from wetland peat, mainly the Far North subarctic wetland regions.
This should be recognized as a planetary emergency because global warming will unavoidably increase to 3C due to inertias, and this methane increase from feedback (caused by global warming) is happening at today's 0.8C warming.
The June 2013 NOAA record shows the highest methane concentrations are the Arctic.
The Arctic like all other regions shows the post 2007 renewed sustained increase.
Even Antarctica shows the same post 2007 sustained methane increase.
The highest methane is Lac La Biche in northern Alberta right on the lower edge of the Canadian wetlands. Atmospheric methane there is 2000ppb with spikes up 2500ppb. Scientists say the methane is being emitted by warming subarctic and tropical wetlands risk in high carbon content peat.
South Pacific methane also shows the post 2007 sustained increase.
Even Antarctica shows the same sustained post 2007 methane increase and most clearly.