Giacomo Grassi | Lightnews

Giacomo Grassi @giacgrassi.bsky.social · 2d

4/ The captain doesn’t know the iceberg’s depth or how the hull would react. Similarly, temperature projections are uncertain. But uncertainty isn’t ignorance and shouldn’t excuse inaction. It should drive us to act on what we can control: the ship’s turning radius—our greenhouse gas emissions.

Giacomo Grassi @giacgrassi.bsky.social · 2d

3/ The ship hasn’t completed its turn (orange: emissions still rising), but change has begun. Compared to ten years ago, the worst risks (red) are less likely. Recent pledges lower risk further (yellow), yet we remain in dangerous waters. To reach safer zones, the turn must accelerate (green).

Giacomo Grassi @giacgrassi.bsky.social · 2d

2/ Imagine a transatlantic liner at full speed: that’s the global economy. Emissions set its course. Scientists spot a huge iceberg and raise the alarm. After long discussions, just like at climate conferences, the danger is acknowledged and the collective decision is made to steer the ship ...

Giacomo Grassi @giacgrassi.bsky.social · 2d

With a mixed-results at COP30 - i.e. good intentions but no concrete plans for the “transition away from fossil fuels” - don’t give up.

Let’s remember the progress made since the Paris Agreement and the options ahead of us. That’s the message of the image below

IPCC @ipcc.bsky.social · 6d

📣 PRESS RELEASE

#IPCC is calling for the nominations of authors for the Methodology Report on Carbon Dioxide Removal Technologies, Carbon Capture Utilization and Storage

Read the PR 👉 www.ipcc.ch/2025/11/19/c...

Submissions close 12 December 2025

🧵 1/3

IPCC @ipcc.bsky.social · 25d

#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

Giacomo Grassi @giacgrassi.bsky.social · Oct 13

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...

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

Oca sapiens @ocasapiens.bsky.social · Aug 6

#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."

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

Giacomo Grassi @giacgrassi.bsky.social · Aug 4

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

Giacomo Grassi @giacgrassi.bsky.social · Aug 4

🤔 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/

Giacomo Grassi @giacgrassi.bsky.social · Aug 4

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/

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

Giacomo Grassi @giacgrassi.bsky.social · Aug 1

read-only text here rdcu.be/eyycF

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

Giacomo Grassi @giacgrassi.bsky.social · Aug 1

rdcu.be/eyycF

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

Giacomo Grassi @giacgrassi.bsky.social · Aug 1

rdcu.be/eyycF

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

Giacomo Grassi @giacgrassi.bsky.social · Aug 1

which is your email?

Giacomo Grassi @giacgrassi.bsky.social · Jul 31

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...

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

Giacomo Grassi @giacgrassi.bsky.social · May 15

Full-text view-only HERE: rdcu.be/el87m

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

Giacomo Grassi @giacgrassi.bsky.social · May 15

Full-text view-only: rdcu.be/el87m

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

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

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

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

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

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

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

Giacomo Grassi @giacgrassi.bsky.social · May 15

📣 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

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

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

Giacomo Grassi @giacgrassi.bsky.social · Feb 21

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.

Katharine Hayhoe @katharinehayhoe.com · 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:

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

Katharine Hayhoe @katharinehayhoe.com · 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:

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

Giacomo Grassi @giacgrassi.bsky.social · Feb 15

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...

Publications - IPCC-TFI

www.ipcc-nggip.iges.or.jp

Giacomo Grassi @giacgrassi.bsky.social · Feb 4

while in Germany ...https://www.thuenen.de/en/themenfelder/klima-und-luft/emissionsinventare-buchhaltung-fuer-den-klimaschutz/treibhausgas-emissionen-lulucf

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