http://www.icevirtuallibrary.com/content/article/10.1680/ensu.12.00022
An earth systems engineering perspective on geoengineering
Brad Allenby
Proceedings of the ICE - Engineering Sustainability, Volume 166, Issue
5, 01 October 2013 , pages 220 –228
The growing recognition of the inadequacies
I usually try to avoid off-topic posts, but this time I feel strongly
enough that I just can't resist temptation.
http://thinkprogress.org/climate/2013/09/30/2699121/real-budget-crisis-co2/
The Real Budget Crisis: ‘The CO2 Emissions Budget Framing Is A Recipe For
Delaying Concrete
See
http://jrscience.wcp.muohio.edu/climatepdfs02/ClimImpts1258VolcaClimChg00.pdf
for discussion of impacts on climate.
On 01/10/2013 00:48, Andrew Lockley wrote:
Source of the great A.D. 1257 mystery eruption unveiled, Samalas
volcano, Rinjani Volcanic Complex, Indonesia
Authors
Poster's note : little new content other than a few names in this layman's
report.
http://blogs.agu.org/geospace/2013/09/27/the-national-academies-contemplate-geoengineering/
The National Academies Contemplate Geoengineering
By Thomas Sumner
The ideas seem lifted from a James Bond super
Poster's note : This is basically just really cool and interesting. But my
excuses for posting it are as follows :
1) It discusses the consequences of the Permian Triassic extinction event,
which may offer a model for extreme global warming and ocean anoxia in a
BAU /feedback world
2) It's got Ken
Here is A discussion Paper on geoengineering in Atmospheric Chemistry and
Physics that came out today
Sensitivity of simulated climate to latitudinal distribution of solar
insolation reduction in SRM geoengineering methods
A. Modak and G. Bala
Divecha Centre for Climate Change Centre for
Hi All
Brad Allenby has got in a muddle about upper and lower atmosphere.
Stephen
Emeritus Professor of Engineering Design School of Engineering
University of Edinburgh Mayfield Road Edinburgh EH9 3JL Scotland
s.sal...@ed.ac.uk Tel +44 (0)131 650 5704 Cell 07795 203 195
Dear colleagues,
Dr. Chad Briggs (Strategic Director, Global Interconnections LLC) has
written an opinion article Is Geoengineering a National Security Risk?.
He takes a military planner's perspective, and outlines some thoughts on
why (in particular, SRM) geoengineering may be overstated as a
Actually, this is not off-topic since I have been in meetings where some have
argued that if geo-engineering methods are deployed successfully then there
is no finite limit or cumulative budget for GHG emissions. (I don' mention this
argument approvingly; just to note the relationship to the
I agree with Dave that this is not off-topic at all. This is not a new
finding by the IPCC. the carbon emissions budget has been a mainstream
and heavily worked concept since at least 2009.
*Meinshausen, M., N. Meinshausen, W. Hare, S. C. B. Raper, K. Frieler, R.
Knutti, D. J. Frame and M. R.
I think there is some value in the layman's perspective. Sometimes it helps
to be further away from the discussion. For example I thought this
observation was rather telling.
The committee gave respectful attention to schemes that even their
proponents consider iffy. Schrag, for instance,
This observation is completely wrong.
Yes, limestone is dissolved by carbonic acid H2CO3 to create bicarbonate
Ca(HCO3-)2. But the deposits in caves are carbonate, formed by the
reverse reaction in which CO2 is emitted. So no carbon is locked away.
Carbonate is just moved from one place to
Thanks for pointing this out. Impractical indeed. Schrag apparently wants to
make CaCO3 by reacting concentrated air CO2 with Ca(OH)2, the latter made from
CaCO3 at great energy and carbon expense, clearly a circular strategy and
energy sink. Making Ca(HCO3)2aq on the other hand would make more
To amplify Al's 400,000 Hiroshimas/day statement below see:
http://theconversation.com/four-hiroshima-bombs-a-second-how-we-imagine-climate-change-16387
It's actually 345,600 Hiroshimas/day or 4 bombs/sec, but you get the idea. 90%
of the heat is going into the ocean. This would seem a powerful
Dear All,
I think this is a terrible comparison to make and should not be used. I
heard someone this summer who was trained by Al Gore use this and she
did not distinguish between all the effects of atomic bombs and the
energy equivalent of the atomic explosions.
Equating nuclear war and
http://onlinelibrary.wiley.com/doi/10.1002/jgrd.50692/abstract
Volcanic cooling signal in tree ring temperature records for the past
millennium
Rosanne D'Arrigo, Rob Wilson, Kevin J. Anchukaitis
Article first published online: 29 AUG 2013
DOI: 10.1002/jgrd.50692
Journal of Geophysical Research:
I agree with Alan's point that the nuclear bomb comparison is too easily
contaminated with all the other associations that the bomb evokes. But perhaps
we could nominate other energy release comparisons that would make the point
that today's forcing is a big deal.
From:
Alan,
I see your point Do you (or does anyone) have a more appropriate
analogy for such large amounts of heat? The tempting thing about the
Hiro is it's just the right amount (63 terajoules) for many global
climate numbers I have sometimes used Civ, the power production of
all of
it might be that for the middle classes of the industrial world that
climate change is really a secondary issue and they'll still have their TV
sets and their McBurgers and McNuggets to eat and life would go on
- thus spake Ken Caldeira, discussing his Sept 2012 Scientific American
Not only is Alan Robock right but this discussion defies all reason. Comparing
heat without considering damage is nonsensical. Comparing the time dimension of
a nuclear weapon in which there is no time to adapt with long term impact of
climate change in which some adaptation is possible defies
The line that David Lewis quotes was intended to represent a dystopian view
of the future in which biodiversity has been depleted and many people in
the developing world are pushed over the edge, but the middle classes of
the industrialized world still have their minds anesthetized by television
While the nuclear bomb analogy is off-base, the discussion is a reasonable one.
Part of the problem with understanding both the problem of climate change and
the logistics of potential solutions is the scale of both the problem and the
solution. Finding ways to help people have a better sense
Dear David,
I think an array of incandescent light bulbs around the world would work
much better. If you have 100 W bulbs, and want to model an imbalance at
the surface of 1 W/m2, then you will need one light bulb every 100 m2,
multiplied by 1 over the fraction of energy emitted by each bulb
Dear Alan and All,
Here is a video we produced at Colby on energy consumption (not global
warming) using lightbulbs. The tall gentleman on the library steps is
Sherry Rowland. Perhaps someone could make an array of Christmas tree
lights?
http://www.youtube.com/watch?v=YSPJOTX06JU
Jim Fleming
List:
I wondered if I could relate CDR (in my case easiest to use biochar) in
some way to Hiroshima bombs. Is the following, using an imbalance methodology,
credible? This assumes the reader has been following the list dialog on
Hiroshima bombs. I am not recommending that this be a
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