Giacomo Grassi
@giacgrassi.bsky.social
Scientist @EU_Commission's Joint Research Centre. Forests, carbon and climate in the science/policy interface. Member #IPCC task force Bureau #AR7. Views mine.
Environmental science
54%
Geography
14%
Reposted by Giacomo Grassi
IPCC
@ipcc.bsky.social
· 10d
#IPCC agrees on the scientific content of the remaining methodology report in the seventh assessment cycle and 2026 workplan for the three key climate reports in Lima, 🇵🇪 Peru.
🔗 www.ipcc.ch/2025/10/31/p...
📸 ENB - IISD - Anastasia Rodopoulou
🔗 www.ipcc.ch/2025/10/31/p...
📸 ENB - IISD - Anastasia Rodopoulou
PresaDiretta 2025/26 - Missione Terra, quel che resta dei ghiacci - 12/10/2025 - Video - RaiPlay
Biomass, il satellite che studia la materia vivente presente nelle foreste. Cryosat, il satellite che da 15 anni monitora la fusione dei ghiacciai: grazie ai suoi dati, il progetto Glambie che riunisc...
www.raiplay.it
Che la causa del cambiamento climatico siamo noi è in realtà una buona notizia.
Spiego il perché nella parte finale (min 17:30) di questa bella puntata di Presa Diretta.
www.raiplay.it/video/2025/1...
Spiego il perché nella parte finale (min 17:30) di questa bella puntata di Presa Diretta.
www.raiplay.it/video/2025/1...
Reposted by Giacomo Grassi
Oca sapiens
@ocasapiens.bsky.social
· Aug 6
Quando la scienza si piega alla politica: il negazionismo climatico nel rapporto del Dipartimento dell’Energia USA
Il 23 luglio 2025, il Dipartimento dell’Energia (DOE) degli Stati Uniti ha pubblicato un documento intitolato A Critical Review of Impacts of Greenhouse Gas E
www.climalteranti.it
#USpolitics
#AGWdeniers
@giacgrassi.bsky.social e @caserinik.bsky.social fanno a polpette il rapporto dei 5 negaioli per il DOE. Sono stati più veloci del solito, ma gli argomenti di quei "mercanti di dubbi... sono già stati più volte confutati anche su Climalteranti."
#AGWdeniers
@giacgrassi.bsky.social e @caserinik.bsky.social fanno a polpette il rapporto dei 5 negaioli per il DOE. Sono stati più veloci del solito, ma gli argomenti di quei "mercanti di dubbi... sono già stati più volte confutati anche su Climalteranti."
thanks to the great team of co-authors, including Michel den Elzen, Zuelclady M.F. Araujo Gutierrez, Will Lamb, Nicklas Forsell, Joana B. Melo, Simone Rossi, Malte Meinshausen, Sandro Federici, Matthew GIDDEN, Kimon Keramidas, Anu Korosuo
🤔 However, land use remains a blind spot in tracking progress under the #ParisAgreement, mainly due to inconsistencies between global models and country-reported data.
💡 It is crucial that future #GlobalStocktakes include comparisons between modeled and country-provided net land-use emissions.
2/
💡 It is crucial that future #GlobalStocktakes include comparisons between modeled and country-provided net land-use emissions.
2/
Land remains a blind spot in tracking progress under the Paris Agreement due to lack of data comparability
Communications Earth & Environment - Discrepancies exist between data used in countries’ greenhouse gas inventories and modelled benchmarks for the Paris agreement, according to an...
rdcu.be
What is the contribution of land use to countries' climate pledges?
🖋️ A new paper led by Rosa Roman-Cuesta explores this question and offers a way forward.
🌲 The study finds that land use makes up a quarter of global 2030 mitigation pledges — mostly reliant on external support.
rdcu.be/eydhU
1/
🖋️ A new paper led by Rosa Roman-Cuesta explores this question and offers a way forward.
🌲 The study finds that land use makes up a quarter of global 2030 mitigation pledges — mostly reliant on external support.
rdcu.be/eydhU
1/
Securing the forest carbon sink for the European Union’s climate ambition
Nature - Actionable research recommendations are outlined to improve the monitoring and modelling of forest resources and their carbon sink, and to better inform forest management decisions and the...
rdcu.be
read-only text here rdcu.be/eyycF
which is your email?
Reposted by Glen P. Peters
Giacomo Grassi
@giacgrassi.bsky.social
· Jul 31
Securing the forest carbon sink for the European Union’s climate ambition - Nature
Actionable research recommendations are outlined to improve the monitoring and modelling of forest resources and their carbon sink, and to better inform forest management decisions and the European Gr...
www.nature.com
Why is the European forest carbon sink declining?
How science can help reversing this trend?
A perspective paper in Nature discusses these questions, highlighting the importance to better monitor forest resources and their resilience.
www.nature.com/articles/s41...
How science can help reversing this trend?
A perspective paper in Nature discusses these questions, highlighting the importance to better monitor forest resources and their resilience.
www.nature.com/articles/s41...
Giacomo Grassi
@giacgrassi.bsky.social
· May 15
Improving land-use emission estimates under the Paris Agreement
Nature Sustainability - Climate science and national emissions reporting communities have historically used different definitions and methods for anthropogenic land-based carbon removals. As the...
rdcu.be
Full-text view-only HERE: rdcu.be/el87m
Giacomo Grassi
@giacgrassi.bsky.social
· May 15
Improving land-use emission estimates under the Paris Agreement
Nature Sustainability - Climate science and national emissions reporting communities have historically used different definitions and methods for anthropogenic land-based carbon removals. As the...
rdcu.be
Full-text view-only: rdcu.be/el87m
Giacomo Grassi
@giacgrassi.bsky.social
· May 15
Thanks to the stellar co-authors, including @glenpeters.bsky.social , @pepcanadell.bsky.social , @gidden.bsky.social and others, and to all participants of the IPCC Expert Meeting.
7/7
7/7
Giacomo Grassi
@giacgrassi.bsky.social
· May 15
This is relevant for forest-rich nations, where “natural” sinks often play a major role in net-zero pledges.
Policymakers need to grasp these implications and adjust their climate ambition accordingly
6/7
Policymakers need to grasp these implications and adjust their climate ambition accordingly
6/7
Giacomo Grassi
@giacgrassi.bsky.social
· May 15
We also urge the scientific community to generate these inventory-aligned estimates and scenarios, and to explore the implications.
Key takeaways: under inventory definitions, the remaining carbon budget is smaller—and reaching net-zero CO₂ alone is not enough to stop warming.
5/7
Key takeaways: under inventory definitions, the remaining carbon budget is smaller—and reaching net-zero CO₂ alone is not enough to stop warming.
5/7
Giacomo Grassi
@giacgrassi.bsky.social
· May 15
Drawing on prior studies and IPCC Expert Meetings, the IPCC has recently decided that its 7th Assessment Report will present land-use CO₂ estimates and scenarios that align with national inventory definitions.
Our Comment explains why this is a crucial step forward.
4/7
Our Comment explains why this is a crucial step forward.
4/7
Giacomo Grassi
@giacgrassi.bsky.social
· May 15
These differing definitions are like two languages: each valid in its own context, but hard to compare without proper translation.
Reconciling them is key for aligning global models, national inventories, and Earth observation — ultimately building trust in land-use emission estimates.
3/7
Reconciling them is key for aligning global models, national inventories, and Earth observation — ultimately building trust in land-use emission estimates.
3/7
Giacomo Grassi
@giacgrassi.bsky.social
· May 15
Climate science and national reporting use different definitions for anthropogenic land-use CO₂ fluxes.
This disconnect has led to a 7 billion-tonne annual gap in CO₂ estimates from land use—equivalent to 20% of global fossil CO₂ emissions—causing confusion among scientists and policymakers
2/7
This disconnect has led to a 7 billion-tonne annual gap in CO₂ estimates from land use—equivalent to 20% of global fossil CO₂ emissions—causing confusion among scientists and policymakers
2/7
Giacomo Grassi
@giacgrassi.bsky.social
· May 15
Improving land-use emission estimates under the Paris Agreement - Nature Sustainability
Climate science and national emissions reporting communities have historically used different definitions and methods for anthropogenic land-based carbon removals. As the mitigation agenda accelerates...
www.nature.com
📣 New Comment on Improving land-use emission estimates under the Paris Agreement in Nature Sustainability www.nature.com/articles/s41...
Land carbon removals are key on the path to net-zero.
Yet, confusion exists on what “anthropogenic” land-use C fluxes are.
#LULUCF #IPCC #ParisAgreement
1/7
Land carbon removals are key on the path to net-zero.
Yet, confusion exists on what “anthropogenic” land-use C fluxes are.
#LULUCF #IPCC #ParisAgreement
1/7
Giacomo Grassi
@giacgrassi.bsky.social
· May 15
On 6–7 May 2025, a JRC-EEA workshop on Land Use Land-Use Change and Forestry (LULUCF) gathered in Ispra (IT) over 50 GHG inventory experts, scientists and policymakers.
We discussed challenges in GHG reporting and the decline of forest carbon sinks in Europe.
Agenda/presentations: lnkd.in/dkJNxSWE
We discussed challenges in GHG reporting and the decline of forest carbon sinks in Europe.
Agenda/presentations: lnkd.in/dkJNxSWE
Giacomo Grassi
@giacgrassi.bsky.social
· Feb 21
‼️The US-based @ipcc.bsky.social technical support unit (TSU) for Working Group 3 Co-Chairs has been terminated, and the US won’t be attending next week’s IPCC meeting where the AR7 chapter outlines will be approved.
More by @afreedma.bsky.social here:
More by @afreedma.bsky.social here:
Scoop: U.S. delegation pulled from key U.N. climate science meeting
The IPCC meeting in China is slated to determine the content in the group's next series of reports.
www.axios.com
This is outrageous. Stupidity at work.
It’s a sign of ideological hostility to everything that involves a multilateral dialogue and cooperation.
If you ignore climate change, climate change will not ignore you.
It’s a sign of ideological hostility to everything that involves a multilateral dialogue and cooperation.
If you ignore climate change, climate change will not ignore you.
Reposted by Peter A. Stott, Nicole Boivin, Gunnar Luderer , and 17 more Peter A. Stott, Nicole Boivin, Gunnar Luderer, Kornelis Blok, Chris Smith, Tatiana Ilyina, Roland Séférian, Giacomo Grassi, Sharon A. Robinson, Christoph Scherber, Lauren B. Buckley, Olaf Weber, Tanya Heikkila, Xin Zhao, Jan Christoph Steckel, William F. Lamb, Meaghan Daly, Cyril Masselot, Sylvia Karlsson‐Vinkhuyzen, Rémy Beugnon
Katharine Hayhoe
@katharinehayhoe.com
· Feb 21
Scoop: U.S. delegation pulled from key U.N. climate science meeting
The IPCC meeting in China is slated to determine the content in the group's next series of reports.
www.axios.com
‼️The US-based @ipcc.bsky.social technical support unit (TSU) for Working Group 3 Co-Chairs has been terminated, and the US won’t be attending next week’s IPCC meeting where the AR7 chapter outlines will be approved.
More by @afreedma.bsky.social here:
More by @afreedma.bsky.social here:
Giacomo Grassi
@giacgrassi.bsky.social
· Feb 15
Publications - IPCC-TFI
www.ipcc-nggip.iges.or.jp
And for those wanting a deep dive into the complex issue of different definitions of anthropogenic vs natural carbon fluxes, here is the final report and presentations made at the #IPCC expert meeting on reconciling land use emissions, held last July
www.ipcc-nggip.iges.or.jp/public/mtdoc...
www.ipcc-nggip.iges.or.jp/public/mtdoc...
while in Germany ...https://www.thuenen.de/en/themenfelder/klima-und-luft/emissionsinventare-buchhaltung-fuer-den-klimaschutz/treibhausgas-emissionen-lulucf
Giacomo Grassi
@giacgrassi.bsky.social
· Jan 13
Radio3 Scienza | S2025 | 2024: l'anno più caldo di sempre | Rai Radio 3 | RaiPlay Sound
2024: l'anno più caldo di sempre - Radio3 Scienza - Venerdì scorso il servizio Copernicus, il programma coordinato e gestito dalla Commissione europea per il monitoraggio del nostro pianeta, ha certif...
www.raiplaysound.it
2024: l'anno più caldo di sempre a #Radio3Scienza.
Dopo l'ottima spiegazione di Elisa Palazzi, discuto cosa significhi “net-zero”, e perché stimare gli assorbimenti di CO2 da parte delle foreste è particolarmente complicato.
www.raiplaysound.it/audio/2025/0...
Dopo l'ottima spiegazione di Elisa Palazzi, discuto cosa significhi “net-zero”, e perché stimare gli assorbimenti di CO2 da parte delle foreste è particolarmente complicato.
www.raiplaysound.it/audio/2025/0...
Giacomo Grassi
@giacgrassi.bsky.social
· Dec 16
The @ipcc.bsky.social #AR7 scoping meeting successfully took place in Kuala Lumpur last week, with more than 230 experts from 70 countries drafting the outlines of the three Working Group contributions to #IPCC's seventh report assessing policy-relevant science on #climatechange.
Honored to have contributed to the IPCC AR7 scoping meeting last week
Reposted by Piers M. Forster, Roland Séférian, Giacomo Grassi
The @ipcc.bsky.social #AR7 scoping meeting successfully took place in Kuala Lumpur last week, with more than 230 experts from 70 countries drafting the outlines of the three Working Group contributions to #IPCC's seventh report assessing policy-relevant science on #climatechange.
Geological Net Zero and the need for disaggregated accounting for carbon sinks - Nature
Nature - Geological Net Zero and the need for disaggregated accounting for carbon sinks
www.nature.com
Clear post.
Useful to remember that national GHG inventories use a definition of anthropogenic sinks which is different from climate models (and from this post).
This has important implications for net-zero goals and warming projections, e.g.
www.nature.com/articles/s41...
Useful to remember that national GHG inventories use a definition of anthropogenic sinks which is different from climate models (and from this post).
This has important implications for net-zero goals and warming projections, e.g.
www.nature.com/articles/s41...
Giacomo Grassi
@giacgrassi.bsky.social
· Nov 19
https://www.ipcc-nggip.iges.or.jp/public/mtdocs/2407_EM_Land.html…
Is land use a source or a sink of CO2 globally? Well, it depends who you ask.
A dialogue has started to reconcile different estimates. Two recent analyses offer complementary views:
-IPCC Expert Meeting www.ipcc-nggip.iges.or.jp/public/mtdoc...
-Allen et al. 2024 www.nature.com/articles/s41...
A dialogue has started to reconcile different estimates. Two recent analyses offer complementary views:
-IPCC Expert Meeting www.ipcc-nggip.iges.or.jp/public/mtdoc...
-Allen et al. 2024 www.nature.com/articles/s41...