Two recent independent studies may explain the rise in Methane levels in the atmosphere. Levels of the molecule Hydroxyl, have dropped about 8 percent since 2007. This molecule is known to destroy Methane, which might explain why Methane levels have steadily risen while emissions have dropped slightly. The two studies propose that the Hydroxyl decline slowed the breakdown of atmospheric methane, boosting levels of the greenhouse gas.
This information is useful because one resolution to our Methane level problem in the atmosphere may be to increase Hydroxyl levels. Of course any tampering with chemical levels in the atmosphere will have unseen consequences so we must continue research and be vigilant in our search for an impossible solution.