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Thanks, Maggie. I had missed this too. It's important to note, along with the possible positive feedback processes, the simultaneous possible cooling effect on world climate of any large volume of air-borne volcanic ash. I don't know how to estimate the relative weights of the opposing effects. Chandler On 2017-12-29 4:19 PM, Maggie Zhou wrote: > I missed this in the summer - > Most worrying is the following feedback loop: global warming -> > melting icesheet -> less pressure on top of lands -> more seismic > activity including volcanoes & earthquakes -> accelerated melting of > ice sheets, and ALSO enlargement of the ozone hole and abrupt warming > (see 2nd & 3rd links below)! > Scientists discover 91 volcanoes below Antarctic ice sheet > 'This is in addition to 47 already known about and eruption would melt > more ice in region affected by climate change' > https://www.theguardian.com/world/2017/aug/12/scientists-discover-91-volcanos-antarctica > > http://www.pnas.org/content/114/38/10035.abstract(full text free) > http://blogs.agu.org/geospace/2017/03/14/volcanic-eruption-expanded-ozone-hole-record-size/ > Maggie