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After a relative leveling off of atmospheric methane levels, the US National Oceanographic and Atmospheric Administration released new figures indicating that there has been a large rise in global atmospheric methane levels over the past year. While certainly not a trend, it is something to keep an eye on. Atmospheric methane, coming from cows, landfills, forests, and melting permafrost, does last long in the atmosphere - thus the recent leveling off - however, it causes about 25 times more warming than carbon dioxide!