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Doesn't methane break down in the atmosphere fairly rapidly? From what I'm reading, methane lasts about 12 years while CO2 can stay in the atmosphere for potent

Doesn't methane break down in the atmosphere fairly rapidly? From what I'm reading, methane lasts about 12 years while CO2 can stay in the atmosphere for potentially thousands. Unless we choke to death on methane isn't this less of an issue than CO2 buildup?

stcredzero 9y ago
Methane is a very potent greenhouse gas, and the release would be absolutely huge. The momentary spike would well cause a lot of CO2 to be released.
- mirimir 9y ago
  On a positive note, while it may not suffice to save human civilization, CO2 likely won't get baked out of rocks. Or at least, it hasn't after previous "methane gun" events.
  - stcredzero 9y ago
    What has been released after the previous "methane gun" events?
    - mirimir 9y ago
      The Paleocene–Eocene Thermal Maximum[0] and the Permian–Triassic extinction[1] may have involved "methane gun" events. 0) http://www.pnas.org/content/113/28/7739.full.pdf http://www.pnas.org/content/113/28/7739.full.pdf 1) http://www.bbc.co.uk/science/horizon/2002/dayearthdied.shtml http://www.bbc.co.uk/science/horizon/2002/dayearthdied.shtml
istorical 9y ago
"While CO2 persists in the atmosphere for centuries, or even millennia, methane warms the planet on steroids for a decade or two before decaying to CO2. In those short decades, methane warms the planet by 86 times as much as CO2, according to the Intergovernmental Panel on Climate Change." Source: https://www.scientificamerican.com/article/how-bad-of-a-greenhouse-gas-is-methane/ https://www.scientificamerican.com/article/how-bad-of-a-gree...
mikeash 9y ago
The fear is that the change will be so fast and so drastic that the short lifetime won't save us. It's thought that runaway methane release could result in 6+ degrees (celsius) of warming within just a few decades as massive amounts of methane are released. The influence of methane would end relatively quickly too, but the damage would be incredible. Nobody is really sure if this would actually happen, though.
fencepost 9y ago
Methane does break down much faster than CO2, but over the time scales being discussed here it's MUCH more powerful. From memory so probably somewhat off it's >80x more potent a greenhouse gas over a decade, dropping to only 20x more potent when measured over a century. The big problem is tipping points. There are a lot of things where an initial big hit can be something you don't recover from, no matter how light the impact might seem when measured over years.

stcredzero 9y ago

Methane is a very potent greenhouse gas, and the release would be absolutely huge. The momentary spike would well cause a lot of CO2 to be released.

mirimir 9y ago
On a positive note, while it may not suffice to save human civilization, CO2 likely won't get baked out of rocks. Or at least, it hasn't after previous "methane gun" events.
- stcredzero 9y ago
  What has been released after the previous "methane gun" events?
  - mirimir 9y ago
    The Paleocene–Eocene Thermal Maximum[0] and the Permian–Triassic extinction[1] may have involved "methane gun" events. 0) http://www.pnas.org/content/113/28/7739.full.pdf http://www.pnas.org/content/113/28/7739.full.pdf 1) http://www.bbc.co.uk/science/horizon/2002/dayearthdied.shtml http://www.bbc.co.uk/science/horizon/2002/dayearthdied.shtml

istorical 9y ago

"While CO2 persists in the atmosphere for centuries, or even millennia, methane warms the planet on steroids for a decade or two before decaying to CO2. In those short decades, methane warms the planet by 86 times as much as CO2, according to the Intergovernmental Panel on Climate Change." Source: https://www.scientificamerican.com/article/how-bad-of-a-greenhouse-gas-is-methane/ https://www.scientificamerican.com/article/how-bad-of-a-gree...

mikeash 9y ago

The fear is that the change will be so fast and so drastic that the short lifetime won't save us. It's thought that runaway methane release could result in 6+ degrees (celsius) of warming within just a few decades as massive amounts of methane are released. The influence of methane would end relatively quickly too, but the damage would be incredible. Nobody is really sure if this would actually happen, though.

fencepost 9y ago

Methane does break down much faster than CO2, but over the time scales being discussed here it's MUCH more powerful. From memory so probably somewhat off it's >80x more potent a greenhouse gas over a decade, dropping to only 20x more potent when measured over a century. The big problem is tipping points. There are a lot of things where an initial big hit can be something you don't recover from, no matter how light the impact might seem when measured over years.