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Glen Peters
@Peters_Glen
, 4 tweets, 3 min read Read on Twitter
Even 1.5°C scenarios with "no or low overshoot" have CO₂ removal (negative emissions), & I suspect at a scale that many are uncomfortable with...

How many realise this? Do people equate "no overshoot" with "no negative CO₂ removal"?

1/3
 #SR15 ipcc.ch/sr15/chapter/2…
The 9 scenarios in #SR15 classified as "no overshoot" hit zero around 2050 & go *net* negative to the tune of about 5-15GtCO₂ in 2100. The actual CO₂ removal *gross* negative emissions is much larger than that.

2/3
 Data: data.ene.iiasa.ac.at/iamc-1.5c-expl…
This was one of the key messages from "The trouble with negative emissions" article with @KevinClimate. The actual CO₂ removal (light orange) is much larger than commonly perceived (black line), as scenarios are generally plotted as "net" emissions!

3/3
 science.sciencemag.org/content/354/63…
Bonus extra: I should add, that in #SR15, "overshoot" is how much a given temperature level is exceeded, which is different to whether it has a peak & decline. A scenario could reach 1.5°C (no overshoot), but then decline to 1.3°C in 2100 because of CO₂ removal. 4/3
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Glen Peters
@Peters_Glen
What emission metric is best?
* Global Warming Potential (GWP)
* Global Temperature Potential (GTP)
* Ocean Heat Content (OHC)

There are many choices, & @AarneClimate reminded me about one of my papers...

(mini thread)

iopscience.iop.org/article/10.108…
The GWP, the "gold" standard, gets a lot of critiques because it does not represent temperature. Though, it does represent the cumulative energy added to the system, & may serve well for things like sea level rise and so on...

Don't forget it was only intended as an example!
2/
The GTP is a measure of temperature, and therefor links very well to the Paris Agreement. Though, the OHC may be more robust as most of the energy sits in the ocean. @RogerAPielkeSr has advocated this for a long time.

See also @hausfath carbonbrief.org/guest-post-obs…
3/
Read 5 tweets
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Glen Peters
@Peters_Glen
THREAD

Will Direct Air Capture grow from a few small facilities to an automotive style industry removing billions of tonnes of CO₂ from the atmosphere every year?

@jongertner explores at @nytclimate, & in this thread I pick up on a few nice quotes...
nytimes.com/2019/02/12/mag…
Most readers will think of Direct Air Capture (DAC) as (permanent) CO₂ Removal from the atmosphere (with underground storage), but most commercial pathways are in agriculture, food, or synthetic fields (which is CO₂ neutral not CO₂ negative). 2/
Wise words @hal_harvey, “The only way that direct air capture becomes meaningful is if we do all the other things we need to do promptly”.

Unfortunately, many think that CO₂ removal is a technology to clean the mess, no, it is only meaningful if the house is already clean. 3/
Read 14 tweets
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Glen Peters
@Peters_Glen
"Elbilene er bare sju prosent av bilparken, så [utslipp] effekten skal ikke være så veldig stor. Vi har hatt en generell trafikkvekst og økning i bilparken siden lenge før elbilene kom på markedet, og det vil maskere noe av virkningen", sier Figenbaum
tu.no/artikler/klima…
Eller, den mindre diplomatiske versjonen fra meg: "Ikke mulig å se noen klimavirkning av norske elbiler"

Vi bør bare innrømme det (som forskere), i stedet for å prøve å finne måter rundt det.
Det er litt som togradersmål: "I see my role as a scientist to point out the obstacles and challenges, not just tell the positive news stories so others can sleep well at night." cicero.oslo.no/no/posts/klima…
Read 3 tweets

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I’ve been glad to see so much public discussion of #NCA4 over the last several days, with #ClimateFriday paralleling Black Friday. Since “Cyber Tuesday” is apparently now a thing, I’d like to declare today #CarbonTuesday. (THREAD 1 see part 2 next)
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Why women shus not visit Sabarimala

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Useful Design
@usefulDesign
@ChristieKngstn @VMorganSchmidt @D_LittleproudMP @farmingforever @BZELandUse NFF talk a big game but no plan to get there. None of their cell-grazing/HM trials have demonstrated simultaneous lower emissions & increase in production levels. @UNFCCC method used in AGEIS inventory is VERY deficient in aggregating Ag sector emissions which takes time… [cont]
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@lorraineelizab6
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