Anna Harper (she/her)

The IPCC’s First Lead Author Meeting for AR7, is taking place in Paris this week. The French Minister for Europe and Foreign Affairs, Mr Jean-Noël Barrot welcomed around 600 authors from more than 100 countries to the Quai d’Orsay on Tuesday evening.

bit.ly/4ir09cC

@agu.org is in a tricky situation with the federal paramilitaries in New Orleans — they can’t make security promises if they aren’t sure they can keep them, and if the state-run convention authority is telling them they can’t bar warrantless agents, they can’t promise to do so.

Speakers at a table for the opening ceremony of the 7th Assessment Cycle First Lead Author Meeting for Working Groups I, II, and III.

Great start to the IPCC lead author meeting!
✔️ Inclusivity was set as a priority for this assessment cycle, we even had a full session on it
🎆 All 3 working groups are together the whole week, it's an exciting opportunity to talk outside discipline boundaries
⏳We have a lot of work to do! Let's go

A climate scientist reflects on 30 years fighting the 'forces of unreason' Thirty years ago, the IPCC agreed on a historic finding: “The balance of evidence suggests a discernible human influence on global climate.”

This is a poignant reflection to read as I prepare to begin my journey as an IPCC author - thank you Ben Santer for sharing this and for the path that you and others have set for this generation of climate scientists.

Hello fellow IPCC author and runner, I just got back from a very similar looking run! It's a nice evening. Good way to start a busy week!

Yesterday I was enjoying quiet coastal Georgia with my family, and today I am headed to Paris for the first author meeting for the next #IPCC report. Sadly, the ecosystems we enjoyed, & my inlaws neighborhood, are at risk from rising sea levels if climate change continues unabated.

Land-use strategies must account not only for C storage potential, but also for wider impacts on food systems, water resources & ecosystems:🔎bit.ly/4qMYPEy

@docaharper.bsky.social @universityofga.bsky.social @exeter.ac.uk G.A. @pik-potsdam.bsky.social @rosieafisher.bsky.social @cicero.oslo.no

Well said. This is very concerning.

An image of two activists wearing long trains reading "end the fossil fuel era" and "phase out fossil fuels" with banners above them reading "stop Amazon oil" and "1.5oC under threat: time to act."

Nearly 30 countries refuse to sign a final #COP30 agreement that doesn't include "fossil fuel phase-out," as negotiations head into overtime.

Live updates from @fionaharvey.bsky.social, @olliemilman.bsky.social and @theguardian.com here: www.theguardian.com/world/live/2...

Talking across disciplinary boundaries was challenging at times, but very rewarding and where the most progress can be made. Changing jobs and country mid-project was another challenge for me - I'm grateful for support from @exeter.ac.uk and @universityofga.bsky.social during the project. (End 🧵)

This work highlights the value of funding multi-year, international collaborations that bridge different modeling communities in this policy-relevant issue of land-based climate mitigation (5/)

We investigated how to include the climate (biophysical) impacts from afforestation and reforestation in IAM scenario development. Important impacts on agricultural yields, runoff, and carbon stocks were found, but a major challenge is how to account for uncertainty in the biophysical effects (4/)

Bioenergy crops with carbon capture and storage can be an effective mitigation method: the mitigation potential is higher when the crops are on existing agricultural land rather than natural land. To reduce impacts on food security, marginal or less productive agricultural land should be used (3/)

The land can help us mitigate climate change through growth of new forests and protection of existing forests & ecosystems, but *the ability of the land to continue to absorb carbon dioxide at current rates is not a sure bet* emphasizing the importance of reduced emissions to slow climate change(2/)

We uncovered systematic differences in how Earth System Models (ESMs) and Integrated Assessment Models (IAMs) calculate carbon stocks and carbon removal potentials, and this project allowed people from both groups to discuss ways to reduce this cross-sectoral model uncertainty in the future (1/)

Excellent summary of the work I contributed to in @esm2025.bsky.social, an EU-funded project that ends this year. Here are my key take-aways in a 🧵 , but I recommend reading this Research Highlight if you want to know more!
Several papers are in preparation from this work, so stay tuned.

COP30: Study reveals “highest possible ambition” for countries' climate pledges | Imperial News | Imperial College London A new study, for the first time, shows how the ‘highest possible ambition’ of countries' climate pledges can be assessed.

COP30: Study reveals “highest possible ambition” for countries' climate pledges

With COP30 kicking off on Monday, a new paper by Julia Schönfeld and Professor Joeri Rogelj provides a framework for assessing countries’ climate pledges 🧵

Learn more: ow.ly/CiB050XnMK2

Speakers will identify how AI can be utilized to enhance weather and climate simulations and models, highlight the overarching technical challenges associated with integrating AI, and explore the most promising applications.

Happening tomorrow: National Academies webinar on AI for Emulation: Weather & Earth Systems Modeling, 10:00 ET. www.nationalacademies.org/event/45650_...

Yeah this is confusing for liberals ... We want fun control but not like this!

Ignoring the harmful effects of climate change will also affect national security.

I'm sorry to hear this

Having spent much actual and emotional time and energy responding to this report, I whole-heartedly agree. Greenhouse gas emissions are bad for our planet, it's not a matter for debate.

Good things are happening today - the side entrance to my building is open again, so I no longer have to carry my bike up stairs and through the main entrance. It's the little things.

Cool side fact: Working Group 1 assesses the physical science of climate change. The US has 15 authors in WG1, 10 of whom are women. In the last report, 6/25 US scientists in WG1 were women. Woop Woop 💪🏼, although it's a shame to see the reduced # of US scientists involved this time around. End 🧵

Because the US State Dept is no longer supporting American involvement in the IPCC, @agu.org and the US Academic Alliance stepped up to nominate 282 experts, from which 37 were selected. (A few more were nominated by other means.) Thanks guys! 🙏🏼

In this time of attacks on climate science in the US, it's important to point out that the IPCC does not set policy, but it provides scientific assessments that form one part of decision making.

This will be my first time participating as a lead author. I've been fascinated by the work of the IPCC and its role in informing climate policy for years, and inspired by those who have served before, so this is a huge honor for me.

I'm excited to contribute to the next IPCC report as a lead author for the WG1 chapter on "Global projections of Earth system responses across scales". We'll be assessing forcings of climate change and the responses across the Earth systems, including my favorite component 🥁... the carbon cycle.

The recent DOE climate science report misrepresents the work of many researchers. Carbon Brief asked those cited to review the parts of the report where their work was used, and we collectively found 100+ misleading or false statements: interactive.carbonbr...