Re: [geo] Permanently >400 ppm?

2015-11-12 Thread John Nissen
Hi Greg, Yes, it is the balance between emissions and removal which has to be changed. Hansen says the CO2 level has to be at or below 350ppm, which is what it was thirty years ago - with 400ppm for the CO2eq level. The Earth System is extremely unlikely to return of its own accord to

Re: [geo] Permanently >400 ppm?

2015-11-10 Thread Greg Rau
More "permanence":http://www.commondreams.org/news/2015/11/09/overheated-planet-entering-uncharted-territory-frightening-speed "WMO Secretary-General Michel Jarraud said this means that we will "soon" be living with globally averaged CO2 levels above the dangerous milestone of 400 ppm "as a

[geo] Permanently >400 ppm?

2015-11-09 Thread Greg Rau
https://scripps.ucsd.edu/programs/keelingcurve/2015/11/09/measurement-note-an-adjustment-to-the-record/ "On Nov. 5, 2015, we made an adjustment to the Scripps Mauna Loa CO2 record that has the effect of increasing concentrations we have reported since April 2015 by 0.4 parts per million (ppm).