Oliver Geden Profile picture
Apr 1, 2019 8 tweets 10 min read Read on X
If Germany would take 1.5C target seriously, it'd need to reach net zero GHG emissions before 2035, @newclimate study finds.
Currently, no political actor in Germany is demanding this, no enviro NGOs, not the Green party, not even @FridayForFuture
newclimate.org/2019/03/14/15c… Image
German (school) students on #climatestrike finally make concrete demands for domestic #climate policy
*net-zero by 2035
*coal phaseout by 2030
*100% renewables by 2030

& already until end-2019
*180 EUR carbon tax
*end of fossil fuel subsidies
*partial coal phaseout
#FFFfordert Image
This will put established environmental NGOs (@bund_net, @NABU_de, @WWF_Deutschland, @greenpeace_de) & Green Party (@Die_Gruenen) under political pressure. They have supported @FridayForFuture in general, but adopting these demands means shifting positions drastically #FFFfordert Image
Within my limited area of expertise, 2 aspects in @FridayForFuture declaration (fridaysforfuture.de/forderungen/) are remarkable:
the timing and the definition of 'net zero' are quite different from what the #IPCC Special Report on 1.5°C (ipcc.ch/sr15/) says/means
#FFFfordert Image
Re: @FridayForFuture's net zero year: Why exactly 2035?
Due to strict fairness considerations or because they want to avoid relying (too much) on negative emissions? IPCC 1.5C database has less stringent global averages compatible w/ #ParisAgreement's 1.5-2°C target
#FFFfordert Image
Re: @FridayForFuture net-zero framing, defining it narrowly as emitting not more greenhouse gases than removed by natural processes. I guess it refers to (human) 'nature-based solutions'. Different from #IPCC, CO2 removal technologies excluded
fridaysforfuture.de/glossar/ #FFFfordert Image
If @FridayForFuture really wants to continue striking until German government meets (main) demands then "net-zero by 2035" would likely mean Friday school strikes well into the 2030s.
fridaysforfuture.de/forderungen/
#FFFfordert Image
while I think it's politically highly implausbile that @FridayForFuture's demands (like 'net-zero Germany by 2035') will be met, it at least highlights the inconsistencies betw. climate policy talk, decisions and action
rdcu.be/0TiG
onlinelibrary.wiley.com/doi/full/10.10…
#FFFfordert Image

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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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