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SUMMARY:Controlling the Climate: can we refreeze the Arctic? - Dr Hugh Hun
 t\, CUED
DTSTART:20170505T153000Z
DTEND:20170505T160000Z
UID:TALK72404@talks.cam.ac.uk
CONTACT:46601
DESCRIPTION:We may want to cool the planet if (when) we fail to meet our C
 O<sub>2</sub>  emissions targets.  There are "geoengineering"  technologie
 s out there almost ready to go and some sound quite scary.  Many pundits q
 uestion whether it is safe to meddle with the climate when we only have on
 e Earth\, but others argue that we haven't much time left before climate c
 hange runs away from us.\n\nThis talk will present two technologies\, one 
 SRM (Solar Radiation\nManagement) and the other GGR (Greenhouse Gas Remova
 l).  The SPICE project ( www.spicepipe.co.uk ) is an SRM technique that at
 tracted a great deal of attention as it considered a means for injecting a
 erosols into the stratosphere using a tethered balloon.  The SPRNGG projec
 t ( www.sprngg.com\n) is a non-CO<sub>2</sub> GGR approach that looks at a
 ir capture of the other important greenhouse gases methane CH<sub>4</sub>\
 , Nitrous Oxide N<sub>2</sub>O  and CFC12.\n\nThe relevance to the Arctic 
 is that SRM may be urgently required to slow down the progress of melting.
   But if we're too late and the arctic permafrost warms up then GGR will b
 e needed to capture billions of tonnes of atmospheric methane.  The scale 
 of the problem is huge\, and we're not well prepared. \n
LOCATION:LR4\, Cambridge University Engineering Department
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