The Intergovernmental Panel on Climate Change (IPCC) admits global warming is irreversible without geoengineering in a report released 27 September 2013. (Reference: www.newscientist.com/article/dn24261-world-wont-cool-without-geoengineering-warns-report.html#.U7fo2LHABid)
As pointed out in the 5 December 2013 issue of Earth System Dynamics, known strategies for geoengineering are unlikely to succeed: "climate geo-engineering cannot simply be used to undo global warming." (Reference: http://phys.org/news/2013-12-geoengineering-approaches-climate.html)
Our path leads directly to the 4 degrees C mark. The conservative International Energy Agency throws in the towel on avoiding 4 degrees C in this video from June 2014. (Reference: video from World Energy Investment Outlook -- especially at the 25-minute mark www.youtube.com/watch?v=awwVbAG0eig)
The 19th Conference of the Parties of the UN Framework Convention on Climate Change (COP 19) held in November 2013 in Warsaw, Poland, was warned by professor of climatology Mark Maslin: "We are already planning for a 4degrees C world because that is where we are heading. I do not know of any scientists who do not believe that." (Reference: http://guymcpherson.com/2013/01/climate-change-summary-and-update)
There is a paper in the 16 December 2013 issue of the Proceedings of the National Academy of Sciences concluding that 4 degrees C terminates the ability of Earth's vegetation to sequester atmospheric carbon dioxide. (Reference: www.sciencedaily.com/releases/2013/12/131216154851.htm)
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