Anna Harper (she/her)

Attention folks in the weather, climate, disaster, wildfire, and Earth science communities: NSF has just published a new "Dear Colleague" letter inviting feedback (by Mar 13) on the proposal to dismantle the National Center for Atmospheric Research (NCAR). www.nsf.gov/funding/...

Similar feelings here. It's a mess. I'm grateful for the inspiring group of authors on this report. I think we will persevere.

Withdrawing the United States from International Organizations, Conventions, and Treaties that Are Contrary to the Interests of the United States MEMORANDUM FOR THE HEADS OF EXECUTIVE DEPARTMENTS AND AGENCIES By the authority vested in me as President by the Constitution and the laws of the United

50. US withdraws from @ipcc.bsky.social, @ipbes.net, @irena-official.bsky.social, Intl Union for the Conservation of Nature, UN Energy, UN Oceans, UN Water, @ununiversity.bsky.social, UNFCCC, among others (Jan. 7, 2026)

I'm excited to moderate this discussion tomorrow (register below👇🏼), which will explore some challenges of AI use in weather and climate applications, including fairness, data democratization, communicating uncertainty, and dealing with data sparse areas or loss of data streams.

You're keeping count. Depressing but helpful to see.

It is hard to overstate how critical @ncar-ucar.bsky.social is to climate science in the US and around the world. It's the beating heart of our field. Generations of scientists have trained there, and almost everyone I know relies on deep collaborations with NCAR scientists. It's end is unthinkable.

Impressive 😂 👏🏼

Bronze plaque saying "A Letter to the Future. Ok is the first Icelandic glacier to lose its status as a glacier. In the next 200 years all our glaciers are expected to follow the same path. This monument is to acknowledge that we know what is happening and what needs to be done. Only you know if we did it. August 2019. 415ppm CO2"

TIL about a memorial ceremony in Iceland in 2019 to mark the end of a glacier, changing the place name from Okjökull to Ok (jökull = glacier). Uncompromising wording on the bronze plaque:
"This is to acknowledge that we know what is happening and what needs to be done. Only you know if we did it".

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