From the article:
'Mere months after atmospheric carbon dioxide permanently surpassed a symbolic threshold of 400 parts per million, scientists have more bad news: emissions of methane, a more potent greenhouse gas, have skyrocketed in the past 20 years—and show no sign of slowing.
'That’s according to a new analysis published Monday in the journal Environmental Research Letters.
‘The report, The Growing Role of Methane in Anthropogenic Climate Change, finds that “methane concentrations in the air began to surge around 2007 and grew precipitously in 2014 and 2015,” observes Phys.org…’
It bears mentioning that increased methane levels in the atmosphere do not translate to increased emission rate.
‘…Methane is 28 times more efficient than carbon dioxide at trapping heat from the sun, making its short-term effects on global warming far more severe.’
Neither methane nor carbon dioxide traps heat from the Sun, they are heated by infra-red from the Earth’s surface, thereby warming the planet. Methane is much less effective than carbon dioxide for that purpose by more than an order of magnitude, and there is much less methane in the atmosphere (according to the graph, 1.8 ppmv compared to 400 ppmv for carbon dioxide).
But unfortunately, the carbon dioxide level is so high that “band saturation” has occurred; the carbon dioxide is absorbing almost all of the infra-red hitting it and further level increases would have negligible effects.