We are the cause of much of the methane in the atmosphere. Gas and oil wells, and rice agriculture. And that CH4 is contributing to about 1/4 of the present warming. A warming that is warming the oceans and resulting in the release of methane from clathrates. Also resulting in land based release of methane from permafrost.
"Scientists are finding hidden climate time bombs—vast reservoirs of
carbon dioxide and methane—scattered under the seafloor across the planet.
And the fuses are burning.
Caps of frozen CO2 or methane, called hydrates, contain the potent greenhouse gases, keeping them from escaping into the ocean and atmosphere. But the ocean is warming as carbon emissions continue to rise, and scientists say the temperature of the seawater surrounding some hydrate caps is within a few degrees of dissolving them.
That could be very, very bad. Carbon dioxide is the most common greenhouse gas, responsible for
about three-quarters of emissions. It can remain in the atmosphere for
thousands of years.
Methane, the main component of natural gas, doesn't stay in the atmosphere as long as CO2—about 12 years—but it is at least
84 times more potent over two decades."
Stores of methane and CO2 in the world's seas are in a strange, icy state, and the waters are warming, creating a ticking carbon time bomb.
www.nationalgeographic.com