Discover and read the best of Twitter Threads about #SRCCL

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The #IPCC 1.5°C Special Report #SR15 used four illustrative pathways that varied by BECCS.

They all have considerable land-use change: 1500 million hectares is 4.5 India's!

If they don't have large-scale BECCS, they have large-scale afforestation. Land impacts unavoidable.

1/
These are the four illustrative pathways. From left to right, they have more and more BECCS (yellow), though this does not correlate with land areas or impacts

From SPM ipcc.ch/sr15/

2/
The #IPCC Special Report on Climate Change & Land #SRCCL says that BECCS is bad at scale (red), while afforestation is good (blue) across all dimensions but food security

But, if "best practice" is used, the BECCS & afforestation seem to be a win-win-win-win. Hmmm...

3/
Read 5 tweets
Too busy, or need poetry? Here’s the #IPCC’s Special Report on Climate Change and Land #SRCCL summarised in 29 #haiku #sciku. (Disclaimer: personal choices here, not representing the same balance as the full report. Apologies for misappropriating this ancient art form…) [1/29]
SPM Section A1.1 [2/29]
SPM Section A1.3 [3/29]
Read 30 tweets
Je vais essayer de transmettre dans ce fil les points clés du rapport @IPCC_CH #GIEC #SRCCL sur le changement climatique et l'utilisation des terres, en utilisant également les figures clés du résumé pour décideurs.
(adaptation de la conférence de presse en 🇫🇷, graphes en 🇬🇧).
Le GIEC a décidé en 2016 de préparer ce rapport spécial, à partir de 7 propositions thématiques issues d'états membres et d'organisations observatrices, touchant aux terres et aux sols.
Ce rapport a donc été préparé en 2 ans par 107 scientifiques qui ont passé en revue plus de 7000 publications scientifiques. Les versions successives des chapitres et du résumé pour décideurs ont bénéficié de plus de 28 000 commentaires d'experts et de gouvernements.
Read 56 tweets
This has not changed from earlier #IPCC assessments (like #AR5 or #SR15), but, not surprisingly, trade-offs with other forms of land-use are better highlighted in #SRCCL
All mitigation pathway archetypes for 1.5-2 °C (RCP1.9/2.6) include large volumes of carbon dioxide removal, even the very optimistic Pathway 6 that excludes engineered CDR (represented by BECCS) but relies on a large land sink ipcc.ch/srccl-report-d… (ch 2.6.2) #SRCCL
Cumulative CDR volumes by 2100 for these 6 archetype mitigation pathways are quite high
P1: 395 Gt BECCS + 73 Gt Afforestation
P2: 466 Gt BECCS + 117 Gt AF
P3: 944 Gt BECCS only
P4: 300 Gt BECCS + 428 Gt AF
P5: 252 Gt BECCS + 128 Gt AF
P6: 124 Gt AF only
#SRCCL
Read 5 tweets
The new @IPCC_CH #SRCCL report is available at ipcc.ch/srccl-report-d… . The SPM is a very interesting read and has several interesting points that jump out at me both generally and from an Ireland perspective. (1/n)
Firstly climate and land degradation are entwined risks. If we want to reduce risk to land we need to get serious about addressing climate change. But also, agriculture globally is c.25% contributor (nationally its higher). Proverbially making a rod for our own backs (2/n)
Secondly, there are no two ways around it that our patterns of consumption matter. Higher consumption places greater stress on the system making it less robust. What does that mean in practical terms? (3/n)
Read 14 tweets
Takeaways from the #IPCC Special Report on #ClimateChange & Land (#SRCCL). A thread.

1) We use a lot of land (much unsustainably)

Humans directly affect ~72% of "global ice-free land surface" & all is impacted by climate change (e.g. through warming & more intense extremes

1/9
2) A two-way interaction

Our use of land drives #ClimateChange ("agriculture, forestry and other land use" are ~23% of global man-made GHG emissions) & climate change adds stresses so worsens existing risks (e.g. biodiversity & degradation from extremes events)

2/9 #IPCC #SRCCL
3) As well as being an emission source, land is a sink

Photosynthesis draws down carbon dioxide from the atmosphere and fixes it in plants (and soils). Overall the land is a net sink of ~29% of total human-induced CO2 emissions.

3/9 #IPCC #SRCCL
Read 9 tweets
THREAD

The next #IPCC Special Report is out, this time on climate change & land (#SRCCL). ipcc.ch/report/srccl/

There is plenty to digest over the coming days, weeks, months, years, but a few initial reactions from the SPM...

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Just to set the scene, no pressure: "Land provides the principal basis for human livelihoods and well-being including the supply of food, freshwater and multiple other ecosystem services, as well as biodiversity." Land is already heavily impacted...
2/
Agriculture, Forestry, & Other Land Uses (AFOLU) are a quarter of global GHG emissions (GWP100).

The natural response of land to human-induced environmental change has been to cause a sink of ~11.2GtCO₂/yr, 29% of global CO₂. This may not last with climate change.

3/
Read 12 tweets
1. After the 2018 @IPCC_CH report spelled out the difference between a 2 Degree and 1.5 Degree world, here's a few thoughts on tomorrow's #SRCCL report that will put the spotlight on how the way we use our land will affect our odds of hitting 1.5 degree and what this means for EU
2. Firstup, despite the deeply worrying state of land use, the existence of the report itself, ahead of the @UNClimateSummit this September and two crucial COP's next year on climate and biodiversity is an important step forward
3. Secondly, it represents a growing consensus on where the solutions are; restoring ecosystems (in particular peatlands), reducing meat consumption and production, securing indigenous land rights
Read 16 tweets

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