Oliver Geden Profile picture
Aug 6, 2019 9 tweets 15 min read Read on X
The EU debate on a net-zero GHG emissions target and its (so far neglected) consequences for Member States. My new SWP policy brief, together with @FelixSchenuit
bit.ly/SWP19C33
#EU2050 #CarbonNeutralEU Image
@FelixSchenuit Currently, EU #netzero debate focuses on target year 2050. It is far from clear that this will be the final negotiation outcome. According to @EU_Commission, a later net zero year would still be within the 'Paris compatible' range
bit.ly/SWP19C33
#EU2050 #CarbonNeutralEU Image
@FelixSchenuit @EU_Commission Many activists (e.g. @FridayForFuture or @CANEurope) argue that EU has to reach #netzero by 2035/40, but it's not that "science says so"
@theCCCuk net zero report has whole chapter on how national GHG targets relate to global IPCC pathways
theccc.org.uk/publication/ne…
#CarbonNeutralEU Image
@FelixSchenuit @EU_Commission @FridayForFuture @CANEurope @theCCCuk Since all EU Member States signed #netzero under Paris Agreement there'll eventually be agreement, whatever the target year is. Depending on kind of package deal Poland & other veto players want, decision could be delayed into early 2020
bit.ly/SWP19C33
#ClimateNeutralEU
@FelixSchenuit @EU_Commission @FridayForFuture @CANEurope @theCCCuk Two questions will be at heart of this deal:
What degree of differentiation betw Member States is still justifiable?
How do attractive long-term goals relate to lack of willingness to implement corresponding measures in short/medium term?
bit.ly/SWP19C33
#ClimateNeutralEU
@FelixSchenuit @EU_Commission @FridayForFuture @CANEurope @theCCCuk On differentiation: MS from Central/Eastern Europe might demand to remain above zero (initially), whereas climate progressive MS would need to do so much carbon removal that they go net negative early. Ireland might look for special deal b/c of agriculture
bit.ly/SWP19C33
@FelixSchenuit @EU_Commission @FridayForFuture @CANEurope @theCCCuk On short to medium term: #netzero 2050 only credible with strengthened #EU2030 target. Higher ambition level also expected for new EU NDC, complicated by likely post-#Brexit withdrawal of UK from EU NDC, weakening the latter to ~37%
bit.ly/SWP19C33
#ClimateNeutralEU
@FelixSchenuit @EU_Commission @FridayForFuture @CANEurope @theCCCuk Finally, core issue for MS will not be strengthened ETS reduction factors but higher national ESR targets for transport/buildings/agriculture, which many MS are projected to miss and where policies easily lead to voter dissatisfaction
bit.ly/SWP19C33
#ClimateNeutralEU
@FelixSchenuit @EU_Commission @FridayForFuture @CANEurope @theCCCuk One more thing: often heard argument that MS like Germany will have to pay billions of Euros for missing national ESR targets in late 2020s is likely premature b/c there might not be enough sellers of surpluses to meet demand, hence no market price
bit.ly/SWP19C33

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More from @Oliver_Geden

Mar 31, 2023
As promised, now more on the topics I was deeply involved in as #IPCC #AR6 Synthesis Report author, both in the Summary for Policymakers & the so-called 'Longer Report':
overhoot, net zero, mitigation pathways (incl. CDR)

1/n
Let's start with "Overshoot" (B.7), where I was responsible for drafting and 'negotiating' in plenary, but of course not alone (mainly together with @chrisd_jones, with whom I worked on corresponding section 3.3.4 in underlying report)
#IPCC #AR6 #SYR
ipcc.ch/report/ar6/syr/
2/n
To understand the Overshoot SPM section B.7, we need to start with B.1 on "Future Climate Change", led by @JuneYiLee1 & @sorensson_anna
#IPCC #AR6 #SYR
ipcc.ch/report/ar6/syr/
3/n
Read 15 tweets
Mar 20, 2023
Unfortunately, the UN Secretary General still doesn't understand difference betw net-zero CO2 and much more ambitious net-zero GHG targets. The famous 2050 is net-zero CO2 for 1.5C, net-zero GHG only some decades later, as per #IPCC WG3 & Synthesis Report
politico.eu/article/climat…
UN Secretary General has been ill-advised by his own high-level expert group on net-zero, which also confuses net-zero CO2 and net-zero GHG.
It is all in the latest #IPCC reports, including the one released today. Why not just "listen to the science"?
Read 4 tweets
Mar 20, 2023
After 3 yrs of hard work & a long approval plenary, we got the #IPCC #AR6 Synthesis Report published today, consisting of the Summary for Policymakers and a full report version ➡️ ipcc.ch/report/ar6/syr/
An ongoing 🧵, starting with SPM fig 1 on adverse climate change impacts
1/n
Every increment of warming matters (SPM.2)
#IPCC #AR6 #SYR
ipcc.ch/report/ar6/syr/
[2/n]
Future climate change to increase impacts and regional differences
#IPCC #AR6 #SYR
ipcc.ch/report/ar6/syr/
[3/n]
Read 16 tweets
Jan 19, 2023
Today we publish the 1st edition of the "State of Carbon Dioxide Removal" report, a global assessment of the current #StateofCDR, and the gap we need to close to achieve the Paris temperature goal.
Full report➡️stateofcdr.org
An ongoing 🧵
[1]
This report compiles a first estimate of the total CDR being deployed (2 GtCO2/yr).
Almost all comes from "conventional" CDR on land, via afforestation, reforestation & forest management.
"Novel" methods don’t contribute much yet.
#StateofCDR
[2]
We provide a calculation of total gross CDR in #IPCC-assessed pathways to keep warming below 1.5C and 2C, including all methods. All pathways involve substantial cumulative CDR volumes (450-1100 GtCO2 by 2100) - in addition to immediate & deep emissions reductions
#StateofCDR
[3]
Read 35 tweets
Nov 8, 2022
The @UN #HLEGReport on Net-zero Emissions Committments is out
The problem though: #IPCC 1.5C pathways don't reach net zero GHG emissions by "2050 or sooner", but by the end of the century. The famous "net zero by 2050" (better "early 2050s) is CO2 only
un.org/en/climatechan…
1/
You might be in disbelief, but have a look at the #IPCC AR6 WG3 Summary for Policymakers, Table SPM.2:
For 1.5C with no or limited overshoot (category C1), pathways reach net-zero CO2 in 2050-2055, but net-zero GHG in 2095-2100
ipcc.ch/report/ar6/wg3…
2/n
The difference between net-zero CO2 and net-zero GHG can be explained by the dominant role of non-CO2 GHGs (methane, nitrous oxide, f-gases) in residual emissions and the dominant role of CO2 in removals
Read 14 tweets
Apr 11, 2022
➡️Only 6 out of 97 scenarios in the #IPCC #AR6 WG3 category C1 ('no to limited overshoot') never cross 1.5C
➡️91 out of 97 cross 1.5C temporarily, and then go back to 1.5°C by 2100

If you read the Summary for Policymakers of IPCC AR6 WG1 (Aug. 2021), this cannot come as surprise
Below the numbers from #IPCC #AR6 WG1. Not sure if this knowledge was conciously included in "keeping 1.5C alive and within reach" messaging around #COP26.
'Overshoot' pathways (= exceedance & return) didn't make it onto the high-level #UNFCCC agenda yet
ipcc.ch/report/ar6/wg1…
The overshoot logic might also a little bit hard to detect in this #IPCC #AR6 WG1 SPM figure. That's because overshoot is quite small (0.1°C) for SSP1-1.9, while at the same time all standard RCP levels (1.9-8.5) are shown in one figure
ipcc.ch/report/ar6/wg1…
Read 6 tweets

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