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.
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
May 15, 2025 at 6:19 AM
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
The first 'State of Carbon Dioxide Removal' is outIt was a pleasure to work with Will Lamb, Thomas Gasser, Matthew Gidden and other great scientists on Chapter 8: The CDR gap
#carbonremoval #negativeemissions
stateofcdr.org
#carbonremoval #negativeemissions
stateofcdr.org
January 20, 2025 at 9:58 PM
The first 'State of Carbon Dioxide Removal' is outIt was a pleasure to work with Will Lamb, Thomas Gasser, Matthew Gidden and other great scientists on Chapter 8: The CDR gap
#carbonremoval #negativeemissions
stateofcdr.org
#carbonremoval #negativeemissions
stateofcdr.org
Thanks for the feedback on the tweet on where we stand in the climate crisis
Some saw excessive optimism. Don't forget: the figure is an analogy, for illustrative purposes.
Others asked to reuse and edit. Here it is (slightly re-edited after comments
drive.google.com/drive/folders/…
Some saw excessive optimism. Don't forget: the figure is an analogy, for illustrative purposes.
Others asked to reuse and edit. Here it is (slightly re-edited after comments
drive.google.com/drive/folders/…
January 20, 2025 at 9:57 PM
Thanks for the feedback on the tweet on where we stand in the climate crisis
Some saw excessive optimism. Don't forget: the figure is an analogy, for illustrative purposes.
Others asked to reuse and edit. Here it is (slightly re-edited after comments
drive.google.com/drive/folders/…
Some saw excessive optimism. Don't forget: the figure is an analogy, for illustrative purposes.
Others asked to reuse and edit. Here it is (slightly re-edited after comments
drive.google.com/drive/folders/…
Communicating the climate crisis to non-experts is difficult. Here I tried to illustrate in a simple way where we stand and where we are heading.
January 20, 2025 at 9:57 PM
Communicating the climate crisis to non-experts is difficult. Here I tried to illustrate in a simple way where we stand and where we are heading.
I love the cover of the UNEP emissions gap report.
It tells everything about the current climate crisis, the short time we have, and the extent of the challenge.
Happy to have worked on chapter 2 (Global emissions trends) with @lamb_wf and others
unep.org/resources/emis…
It tells everything about the current climate crisis, the short time we have, and the extent of the challenge.
Happy to have worked on chapter 2 (Global emissions trends) with @lamb_wf and others
unep.org/resources/emis…
January 20, 2025 at 9:57 PM
I love the cover of the UNEP emissions gap report.
It tells everything about the current climate crisis, the short time we have, and the extent of the challenge.
Happy to have worked on chapter 2 (Global emissions trends) with @lamb_wf and others
unep.org/resources/emis…
It tells everything about the current climate crisis, the short time we have, and the extent of the challenge.
Happy to have worked on chapter 2 (Global emissions trends) with @lamb_wf and others
unep.org/resources/emis…
JRC LULUCF workshop 2022
55 participants in presence and 70 online, sharing challenges, questions and best practices on reporting GHG emissions and removals in land use and forestry in Europe.
Thanks @matteo_vizzarri and colleagues for great support
55 participants in presence and 70 online, sharing challenges, questions and best practices on reporting GHG emissions and removals in land use and forestry in Europe.
Thanks @matteo_vizzarri and colleagues for great support
January 20, 2025 at 9:56 PM
JRC LULUCF workshop 2022
55 participants in presence and 70 online, sharing challenges, questions and best practices on reporting GHG emissions and removals in land use and forestry in Europe.
Thanks @matteo_vizzarri and colleagues for great support
55 participants in presence and 70 online, sharing challenges, questions and best practices on reporting GHG emissions and removals in land use and forestry in Europe.
Thanks @matteo_vizzarri and colleagues for great support
Historic moment:
kickoff of technical part of the #GlobalStocktake
Critical step to implement the #ParisAgreement
Based on the best available science, the collective climate progress will be assessed, with the aim to
trigger additional efforts towards a safer future
kickoff of technical part of the #GlobalStocktake
Critical step to implement the #ParisAgreement
Based on the best available science, the collective climate progress will be assessed, with the aim to
trigger additional efforts towards a safer future
January 20, 2025 at 9:56 PM
Historic moment:
kickoff of technical part of the #GlobalStocktake
Critical step to implement the #ParisAgreement
Based on the best available science, the collective climate progress will be assessed, with the aim to
trigger additional efforts towards a safer future
kickoff of technical part of the #GlobalStocktake
Critical step to implement the #ParisAgreement
Based on the best available science, the collective climate progress will be assessed, with the aim to
trigger additional efforts towards a safer future
After two weeks of intense work, the landmark @IPCC_CH WGIII report has been approvedGreat work of hundreds of authors
Proud of having contributed on land CO2 flux numbers, helping to understand & reconcile large differences among datasets
ipcc.ch/report/sixth-a…
Proud of having contributed on land CO2 flux numbers, helping to understand & reconcile large differences among datasets
ipcc.ch/report/sixth-a…
January 20, 2025 at 9:56 PM
After two weeks of intense work, the landmark @IPCC_CH WGIII report has been approvedGreat work of hundreds of authors
Proud of having contributed on land CO2 flux numbers, helping to understand & reconcile large differences among datasets
ipcc.ch/report/sixth-a…
Proud of having contributed on land CO2 flux numbers, helping to understand & reconcile large differences among datasets
ipcc.ch/report/sixth-a…
3/4 By adding SLAND from non intact forest (>5GtCO2/y) to the original ELUC estimates, numbers become comparable to those from NGHGI. Table A8 from GCB 2021
bit.ly/3CJakU9
bit.ly/3CJakU9
January 20, 2025 at 9:55 PM
3/4 By adding SLAND from non intact forest (>5GtCO2/y) to the original ELUC estimates, numbers become comparable to those from NGHGI. Table A8 from GCB 2021
bit.ly/3CJakU9
bit.ly/3CJakU9
Different ways to assess the anthropogenic forest sink hampers an accurate assessment of collective climate progress under the Paris Agreement.
Adjusting what 'science says' on land mitigation pathways improves this assessment.
Presenting at UNFCCC's 13th Research Dialogue
Adjusting what 'science says' on land mitigation pathways improves this assessment.
Presenting at UNFCCC's 13th Research Dialogue
January 20, 2025 at 9:55 PM
Different ways to assess the anthropogenic forest sink hampers an accurate assessment of collective climate progress under the Paris Agreement.
Adjusting what 'science says' on land mitigation pathways improves this assessment.
Presenting at UNFCCC's 13th Research Dialogue
Adjusting what 'science says' on land mitigation pathways improves this assessment.
Presenting at UNFCCC's 13th Research Dialogue
A study led by @lucia_perugini, that I co-authored along with @ciais_philippe, @Peters_Glen et al, explains how science can contribute to the emerging reporting/ verification needs under Paris.
If you can't measure it, you can't improve it: no good decisions without good data!
If you can't measure it, you can't improve it: no good decisions without good data!
January 20, 2025 at 9:54 PM
A study led by @lucia_perugini, that I co-authored along with @ciais_philippe, @Peters_Glen et al, explains how science can contribute to the emerging reporting/ verification needs under Paris.
If you can't measure it, you can't improve it: no good decisions without good data!
If you can't measure it, you can't improve it: no good decisions without good data!
4/7 How was the message misunderstood?
Many critics claimed that these results are “impossible” and contradict country statistics. That’s untrue, mostly due to misunderstandings and incorrect apple-to-orange comparison.
Many critics claimed that these results are “impossible” and contradict country statistics. That’s untrue, mostly due to misunderstandings and incorrect apple-to-orange comparison.
January 20, 2025 at 9:54 PM
4/7 How was the message misunderstood?
Many critics claimed that these results are “impossible” and contradict country statistics. That’s untrue, mostly due to misunderstandings and incorrect apple-to-orange comparison.
Many critics claimed that these results are “impossible” and contradict country statistics. That’s untrue, mostly due to misunderstandings and incorrect apple-to-orange comparison.
JRC study on harvested forest area: resolving key misunderstandingscomplementsRectified results confirm increase in clear-cut area,but not as abrupt as originally reported. This does not necessarily contradict country statistics
nature.com/articles/s4158… iforest.sisef.org/pdf/?id=ifor00…
nature.com/articles/s4158… iforest.sisef.org/pdf/?id=ifor00…
January 20, 2025 at 9:54 PM
JRC study on harvested forest area: resolving key misunderstandingscomplementsRectified results confirm increase in clear-cut area,but not as abrupt as originally reported. This does not necessarily contradict country statistics
nature.com/articles/s4158… iforest.sisef.org/pdf/?id=ifor00…
nature.com/articles/s4158… iforest.sisef.org/pdf/?id=ifor00…
(7/7) The translation works well. This adjustment lowers the IAMs’ anthropogenic emissions (now matching NGHGIs) but also the cumulative allowable global emissions to reach <<2C. This may affect the countries’ perception of the level of global net emissions they need to achieve.
January 20, 2025 at 9:54 PM
(7/7) The translation works well. This adjustment lowers the IAMs’ anthropogenic emissions (now matching NGHGIs) but also the cumulative allowable global emissions to reach <<2C. This may affect the countries’ perception of the level of global net emissions they need to achieve.
(6/7) Given this difference, which approach is right? Right or wrong is not the right question, the point is that they are not comparable. And the Global stocktake requires comparability. Since changing NGHGIs is impractical, our study “translates” the results from IAMs.
January 20, 2025 at 9:54 PM
(6/7) Given this difference, which approach is right? Right or wrong is not the right question, the point is that they are not comparable. And the Global stocktake requires comparability. Since changing NGHGIs is impractical, our study “translates” the results from IAMs.
(5/7) IAMs and NGHGIs use different approaches to estimate the ‘anthropogenic’ land CO2 sink. The difference (5.5 GtCO2/y) is big enough to complicate the assessment by the Paris Agreement’s Global stocktake of the collective country progress vs. what science suggests as needed.
January 20, 2025 at 9:53 PM
(5/7) IAMs and NGHGIs use different approaches to estimate the ‘anthropogenic’ land CO2 sink. The difference (5.5 GtCO2/y) is big enough to complicate the assessment by the Paris Agreement’s Global stocktake of the collective country progress vs. what science suggests as needed.
(4/7) Let’s start with the context, putting the Paris Agreement inside a car. The actors are the policy makers, the National GHG inventories (NGHGIs) and the Integrated Assessment Models (IAMs
January 20, 2025 at 9:53 PM
(4/7) Let’s start with the context, putting the Paris Agreement inside a car. The actors are the policy makers, the National GHG inventories (NGHGIs) and the Integrated Assessment Models (IAMs