Hi All
Suppose that we have an army and a navy but are hostile to the idea of
having an air-force to the point of not letting anyone think about
flying machines.
In 1900 many people thought exactly that.
Stephen
Stephen Salter
Emeritus Professor of Engineering Design
School of Engineering
University of Edinburgh
Mayfield Road
Edinburgh EH9 3DW
+44 (0) 131 650 5704
On 24/03/2017 09:15, Matthias Honegger wrote:
Dear colleagues
Ever been frustrated trying to tell others, why we must learn more
about negative emissions technologies and solar radiation management?
This Science article
<http://science.sciencemag.org/content/355/6331/1269/tab-pdf> by Johan
Rockström, Owen Gaffney, Joeri Rogelj, Malte Meinshausen, Nebojsa
Nakicenovic, Hans Joachim Schellnhuber brings it home: Meeting the
temperature targets is extremely hard and current policy planning does
not reflect for the necessary steps.
Vox has a nice summary piece
<http://www.vox.com/energy-and-environment/2017/3/23/15028480/roadmap-paris-climate-goals>
on the article's findings:
"They start with the big picture: To hit the Paris climate goals
without geoengineering, the world has to do three broad (and
incredibly ambitious) things:
1) Global CO2 emissions from energy and industry have to fall in half
each decade. That is, in the 2020s, the world cuts emissions in half.
Then we do it again in the 2030s. Then we do it again in the 2040s.
It’s simple but staggering. They dub this the “carbon law.” Lead
author Johan Rockström told me they were thinking of an analogy to
Moore’s law for transistors, and we’ll see why.
2) Net emissions from land use — i.e., from agriculture and
deforestation — have to fall steadily to zero by 2050. This would need
to happen even as the world population grows and we’re feeding ever
more people.
3) Technologies to suck carbon dioxide out of the atmosphere have to
start scaling up massively, until we’re artificially pulling 5
gigatons of CO2 per year out of the atmosphere by 2050 — nearly double
what all the world’s trees and soils already do."
Very best, Matthias Honegger
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