Re: [geo] Zero emissions by 2040?

[Olivier Boucher]

Dear Stephen,

stabilizing emissions is not the same as stabilizing concentrations. For 
stable emissions, one still expects CO2 concentrations to increase for a 
while until a new equilibrium is found (this would take a long time, and 
an even longer time if "natural" emissions start increasing, eg from 
permafrost thawing). Only if emissions decrease drastically, can CO2 
concentration decrease. Figueres et al make it clear that emissions have 
to go to zero.


Best,
Olivier


Hi All

In their Nature paper

http://www.nature.com/news/three-years-to-safeguard-our-climate-1.22201

Figueres et al. write

"In the past three years, global emissions of carbon dioxide from the 
burning of fossil fuels have levelled after rising for decades."


But https://www.co2.earth/daily-co2

shows  atmospheric concentrations as

https://scripps.ucsd.edu/programs/keelingcurve/wp-content/plugins/sio-bluemoon/graphs/mlo_two_years.png

So either something else has emitted almost the same as the claimed 
reductions or the numbers for claimed emissions have been Volkswagened.


Stephen


Emeritus Professor of Engineering Design. School of Engineering, 
University of Edinburgh, Mayfield Road, Edinburgh EH9 3DW, Scotland 
s.sal...@ed.ac.uk, Tel +44 (0)131 650 5704, Cell 07795 203 195, 
WWW.homepages.ed.ac.uk/shs, YouTube Jamie Taylor Power for Change


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Re: [geo] Zero emissions by 2040?

[Stephen Salter]

Hi All

In their Nature paper

http://www.nature.com/news/three-years-to-safeguard-our-climate-1.22201

Figueres et al. write

"In the past three years, global emissions of carbon dioxide from the 
burning of fossil fuels have levelled after rising for decades."


But https://www.co2.earth/daily-co2

shows  atmospheric concentrations as

https://scripps.ucsd.edu/programs/keelingcurve/wp-content/plugins/sio-bluemoon/graphs/mlo_two_years.png

So either something else has emitted almost the same as the claimed 
reductions or the numbers for claimed emissions have been Volkswagened.


Stephen


Emeritus Professor of Engineering Design. School of Engineering, 
University of Edinburgh, Mayfield Road, Edinburgh EH9 3DW, Scotland 
s.sal...@ed.ac.uk, Tel +44 (0)131 650 5704, Cell 07795 203 195, 
WWW.homepages.ed.ac.uk/shs, YouTube Jamie Taylor Power for Change


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[geo] Zero emissions by 2040?

[Greg Rau]

http://www.nature.com/news/three-years-to-safeguard-our-climate-1.22201

"...we must remember that impossible is not a fact, it’s an attitude."
How refreshing. Still, just in case attitudes to prove to be impossible to 
change sufficiently, how about at least mentioning the possibility of negative 
emissions? Or is that an attitude problem also?

Greg

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