Soemano Zeijlmans

Karma: 400

I’m a Research Associate at Giving Green and a Co-director of the Effective Environmentalism Initiative (part-time).

Interested in effective solutions to climate change, environment, animal welfare, and global health and development. Experienced with quantitative and qualitative research, including mathematical modelling and Delphi studies.

Experience:

Research Associate at Giving Green (2025-now)
Co-director of Effective Environmentalism (2024-now)
Research Fellow/Contractor at Ambitious Impact (Sept 2024-Jan 2025)
Policy Analyst at GFI (Oct 2022-June 2023)

Education:

MSc Environmental Economics, Vrije Universiteit Amsterdam
MA Environment, Development and Peace, UN University for Peace
BSc Governance, Economics, and Development, LUC The Hague

Soemano Zeijlmans 1 Apr 2026 13:15 UTC
1 point
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in reply to: Trym Braathen🔸’s comment on: Announcing 8,000,000 Hours: Career advice for the rest of us
Thanks Trym. I just added an application link.

Soemano Zeijlmans 31 Mar 2026 9:44 UTC
3 points
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in reply to: Mo Putera’s comment on: Giving Green Launches New Biodiversity Research and Top Biodiversity Nonprofits
Couldn’t have summarized it better myself. Thanks, Mo!
Have you considered incorporating some considerations related to increasing welfare in your research on reducing biodiversity loss?
I’m sympathetic to the idea that the welfare of wild animals matters for biodiversity work. In the end, we decided to base or prioritization on David’s scores based on multiple biodiversity indicators rather than wild animal welfare, because the latter lens comes with empirical and moral uncertainty. (Such as the population effects that Mo mentioned and which you frequently write about.)
Nonetheless, I think some interventions we consider, such as alternative proteins, bycatch mitigation, and fish meal reliance can also benefit (wild or farmed) animals, albeit not per se in the most cost-effective way.

Soemano Zeijlmans 30 Jan 2025 16:11 UTC

8 points

1 ∶ 2

on: Soemano Zeijlmans’s Quick takes

Which interesting EA-related bluesky accounts do you know of?

I’m not using Twitter anymore since it’s being used to promote hateful views, but Bluesky is quite a cool online space in my opinion.

I’m making a list of Bluesky accounts of EA-related organisations and key people. If you’re active on Bluesky or some of your favourite EA orgs or key people are, please leave a comment with a link to their profile!

I’ve also made an EA (GHD+AW+CC) Starter Pack in case you’re interested. Let me know who I should add! Effective Environmentalism also has a pack with effectiveness-oriented climate change accounts.

Some accounts in no particular order:

@effectiveenvironmentalism.org (my org)

@hannahritchie.bsky.social

@alexholst.bsky.social

@vegardbeyer.bsky.social

@jamesozden.bsky.social

@rowanemslie.bksy.social

@goodfoodinst.bsky.social

@80000hours.bsky.social

@ourworldindata.org

@givinggreen.bsky.social

@brucefriedrich.bsky.social

@cleanaircatf.bsky.social

@ayudaefectiva.bksy.social

@givingwhatwecan.bsky.social

@soemanozeijlmans.eu (that’s me)

Soemano Zeijlmans 30 Jan 2025 16:01 UTC
1 point
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on: AI Audit on Costa Rica
Are you based in Costa Rica? You should totally suggest giving a talk about this at the University for Peace (UPAZ) of the UN in Ciudad Colón! Let me know if you’d like an introduction.

Soemano Zeijlmans 29 Jan 2025 11:28 UTC
1 point
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in reply to: Shakirat Bello ’s comment on: Announcing Applications for the AIM Research Program April 2025
Feel free to send me a direct message on the forum with some questions.

Soemano Zeijlmans 22 Jan 2025 13:28 UTC
1 point
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on: Ways the world is getting better—discussion thread
Even though the Trump presidency denies the consensus on and importance of climate change, there could still be ways to make progress: https://effectiveenvironmentalism.substack.com/p/can-we-make-climate-progress-under

Soemano Zeijlmans 20 Jan 2025 9:02 UTC
21 points
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on: Ways the world is getting better—discussion thread
2024 might have been a global breakout year for geothermal energy. Next generation technologies make it possible to drill for heat in places where this was previously impossible.

Soemano Zeijlmans 18 Jan 2025 15:34 UTC
1 point
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in reply to: Karthik Tadepalli’s comment on: Call for suggestions: Climate change charity ideas with strong co-benefits for humans or animals
Thank you Karthik, this looks really interesting!

Soemano Zeijlmans 17 Jan 2025 12:25 UTC
7 points
1 ∶ 0
on: Announcing Applications for the AIM Research Program April 2025
Hi, I did this program last year and I really enjoyed it. If anyone is considering applying but wants to ask some questions to a former participant to check whether it’s the right fit for them, feel free to send me an email or a forum message!

Soemano Zeijlmans 6 Jan 2025 18:18 UTC
5 points
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in reply to: Vasco Grilo🔸’s comment on: Will a food carbon tax lead to more animals being slaughtered? A quantitative model
You’re right to point out the trade-off between low-carbon production and high welfare standards! Theoretically, it should be possible to adapt the model to weigh the animal welfare impacts on the extensive margin (=number of animals) by the intensity of the suffering of different animals, and to make intensity of suffering in turn a function of the carbon tax. That makes the whole model a bit more wonky but I think it’s important work that needs to be done.
I would say taxing the negative effects on farmed animals based on the time they spend in pain, as assessed by the Welfare Footprint Project (WFP), is robustly beneficial.
I agree! I think it will be quite difficult to implement this, though. Will policymakers like to implement a tax based on ‘suffering units’ with quite some uncertainty? I wonder if we can find a decent proxy that is easier for taxation.

Soemano Zeijlmans 6 Jan 2025 18:09 UTC
4 points
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in reply to: geoffrey’s comment on: Will a food carbon tax lead to more animals being slaughtered? A quantitative model
Thank you for the kind words and the useful feedback!
- My understanding is that calibration is picking numbers for parameters in a otherwise pre-defined model to make it match the real world, and what you’re describing I think of as estimation rather than calibration. I’ll add a footnote to make my use of the word a little clearer!
- You’re right on the validity of the Bouyssou et al. (2024) paper. There are quite some differences in the measured elasticity estimates in the literature, unfortunately. I’m more worried about the own-price elasticity of supply, though, as the literature is much more scarce and old.

Soemano Zeijlmans 19 Nov 2024 9:07 UTC
10 points
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on: Climate Giving as an Individual
I think one factor that adds uncertainty to climate giving is that effective climate action requires systems change and innovation breakthroughs, and that you can’t simply put a price tag on these two because advocacy and innovation can fail. A more bednet-style approach to climate giving, such as forest protection and reforestation, seems promising because it offers high certainty and hardly any political opposition. Even then, these direct interventions have all kinds of uncertainty related to permanence (will the forest be cut down again?), additionality (would the forest have regrown naturally?), and leakage (will people just cut down different trees?). Unlike in global health and development, directly tackling emissions in one place can increase it somewhere else.
Personally, I’ve come to terms with the idea that climate action is inherently uncertain. I can never pin down how my actions reduced global emissions because there’s a high chance of failure. But if we pool the probability of the efforts of thousands of people, we can collectively say that we very likely made a big dent in emissions because we can spread the risk over many donors, activists, and professionals.
My intuition is the situation is different for larger organizations and donors who can afford to spread their bets and can do more to single-handedly galvanize an area of research or policy.
How would you feel about donating to a high-impact grantmaking funds that spreads their climate bets and works to advance entire areas or research and policies? If you donate to the Founders Pledge climate fund or the Giving Green fund, for example, your donations are pooled with those of hundreds to thousands of other people who collectively can spread their bets and build new areas or research and policy.
(PS. Setting up donations to funds instead of individual charities has some additional benefits. It helps to allocate funding to charities when they need it most, they can make grants to individual projects that don’t need continuous funding, and funds can change their recipients if other charities become more effective. See the EE website.)

Soemano Zeijlmans 18 Nov 2024 10:00 UTC
0 points
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in reply to: Trym Braathen🔸’s comment on: Effective Environmentalism has re-launched! (And we’re looking for funding)
Thank you Trym!

Soemano Zeijlmans 14 Nov 2024 22:35 UTC
9 points
1 ∶ 0
on: How would your project use extra funding? (Marginal Funding Week 2024)
We’re looking for seed funding for Effective Environmentalism, a field-building initiative.
Link to stand-alone post: Effective Environmentalism has re-launched! (And we’re looking for funding)
Effective Environmentalism is currently not funded, and we’d be able to use seed funding to devote time to spread EA ideas in the environmental movement and grow an effective environmentalism community!
Name of the project: Effective Environmentalism
My role: Co-director
How we would use extra donations: We would use a seed grant to devote time to the project, particularly for community-building, providing introductory resources and information to environmental professionals, and outreach to the environmental community.
Marginal funding: This would be our first funding since the re-launch.

Soemano Zeijlmans 22 Oct 2024 9:59 UTC
1 point
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in reply to: Joel Tan🔸’s comment on: Weighted Factor Models: Consider using the geometric mean instead of the arithmetic mean
Good point on the error sensitivity. The geometric mean penalizes low scores more so it increases the probability of a false negative/type II error: an alternative that should be prioritised is not prioritised.

Soemano Zeijlmans 14 Sep 2024 16:48 UTC
1 point
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in reply to: Said Bouziane’s comment on: What are your favourite videos to combat climate anxiety?
Glad to hear!
@DLMRBN 🔸 and I write a monthly newsletter on climate action. Feel free to subscribe if you wanna read more!
https://effectiveenvironmentalism.substack.com/

Soemano Zeijlmans 13 Sep 2024 13:36 UTC
1 point
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on: Seeking High-Impact Project Ideas for Consultancy Firm
Try to see if your company’s expertise match with any of the recommended fields of work by Giving Green and High Impact Engineers! Especially this latter link is probably interesting for you and your colleagues.
I think that @Ulrik Horn’s suggestion about how to adapt to worst-case climate scenarios is a good one, especially if you focus on places that are likely severely hit but don’t have adequate plans for adaptation yet.
Some first ideas, going by the expertise of the company:
- Chemical regulation (e.g., REACH) and LCA (Life Cycle Assessment) - Helping firms comply is probably not the most cost-effective, since compliance is mandatory, so they’ll just find another consultancy firm. Counterfactual is probably low here.
- Circular economy. I’d say this really depends on which sector you’re trying to make circular. Something related to the circular use of rare earth materials for the energy transition seems promising, but this is still a broad theme.
- Soil remediation. - Don’t know enough to comment.
- Environmental permits and environmental impact assessments (effects on water, air quality, biodiversity, etc.). Similar to my first comment—if this is for compliance, firms will hire a consultant anyway, so the counterfactual here is lower. If you do EIAs or permitting for important new environmental infrastructure (e.g. hot rock geothermal), this may be different.
- District heating networks. This is interesting, if you can contribute to quickly deploying geothermal energy around the world! Talk with the folks at Project Innerspace to know more.
- Electricity grids. There’s a big potential here to electrify heavy industries that now rely on fossil fuels. The price of renewables has been dropping quite rapidly, but there’s quite a challenge in using renewables for hard-to-decarbonise processes like cement. Talk to or visit the websites of e.g. Future Cleantech Architects, Clean Air Task Force, and Industrious Labs to know more! I reckon energy storage and load shifting could be interesting ones to look at too! And maybe easier to get government funding for.
- Sustainability and biodiversity consultancy—A little to broad to comment on.
- Mobility solutions (design of roads, bridges, etc.) - no comment
- Sewerage and water infrastructure—EU countries have a lot of their sewerage and water infrastructure in order already, so within the EU I don’t think this is the most cost-effective work on the margin. Some really innovative solutions could be interesting, perhaps. E.g. desalinisation?
- Building and factory design. This seems promising. Lots of industrial processes are hard to get rid of (e.g. we’ll need cement, and worldwide demand is set to increase!) but there hasn’t been a lot of work on clean production in this area. Looking at cleaner production of cement, steel, or other industries seems promising, and factory design is probably a big part of that. Try to reach out to Industrious Labs!

Soemano Zeijlmans 13 Sep 2024 13:10 UTC
3 points
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on: What are your favourite videos to combat climate anxiety?
In general, I find most channels posting ‘positive climate news’ honestly a bit annoying because they tend to focus on things that really don’t matter all that much in the big picture, or present their solution as a silver bullet while in fact there is none. (But maybe I’m a bit too critical here.)

If you’re interested, we’ve compiled a big list of climate-related resources on the Effective Environmentalism website—some of which are quite hopeful! For example, the books Not the End of the World and Regenesis. There are also a bunch of podcasts and videos on climate solutions that have a bit of a “yes we can” vibe.
https://www.effectiveenvironmentalism.org/resources
Outside EA circles, I really love the YouTube channel Just Have a Think for some climate hope. And (not a video, but a static image), the falling costs of solar is one of the most hopeful graphics in the climate cause area!

Soemano Zeijlmans 9 Sep 2024 23:15 UTC
14 points
6 ∶ 0
on: Mortality Cost of Taxation
I like the idea of measuring or anticipating the effects of a tax in units of deaths avoided/caused and quality of life gained/lost instead of in monetary terms. The monetary measurement of the impacts of a tax (the common approach among economists) can be quite a bad proxy for actual things we care about: saving and improving lives. There’s actually a growing field of economics aiming to replace the GDP measure with quality of life measurements.
I understand your causal mechanism to be as follows: (1) taxation reduces people’s income, (2) having less income makes working risky jobs financially more attractive, (3) this causes more people to die. While this sounds plausible, I see quite a few problems with the approach that you’re suggesting, which I’ll cover below. (I won’t go in-depth into the calculation you used since you already mentioned that it’s not accurate and I assume the point of your post is to advocate for starting a subdiscipline of economics, rather than providing a method for calculation.)
Use of VSL estimates
VSL estimates come from looking at the wage differences between similar jobs with different occupational fatality rates, for example lumberjacks and gardeners. In the USA, for every $13 million or so in increased wages among we-assume-otherwise-identical jobs, one person dies on the job.
VSL estimates are intended be used to understand how people value small reductions in risk, not to predict the outcome of increased wages on deaths. Greater risk leads to higher pay, but higher pay doesn’t lead to this increase in deaths per se. For example, demand for risky jobs like firefighters isn’t very elastic (the number of firefighters society needs is more or less fixed), and even if that wasn’t the case, less qualified or experienced people may enter the field. I wouldn’t use the VSL for this purpose since the methods used to calculate it don’t establish this causal link.
Not a lot of people die in workplace accidents
I don’t think people taking riskier jobs, as the VSL approach would assume, is the primary negative impact of taxation. Rather, I think reducing people’s spendable income makes them less likely to buy healthy food, less likely to live in air-conditioned or heated houses, and less likely to be able to afford medical bills. Only a very small number of people actually die in accidents—let alone workplace accidents. So if we want to know the mortality effect of a tax, it would be more interesting to research questions such as: what is the effect of this tax on cardiovascular health (e.g. unable to buy healthy food) or lung health (e.g. air pollution).
Taxation is used to reduce mortality
If it is not obvious to you that these numbers are all more than zero, consider the basic facts that poverty kills people, and taxes take money from people.
Interestingly, having low income, low wealth, low education, and low social status are very strong determinants of early mortality. This is exactly what taxation is trying to tackle. If we take the data for my country (The Netherlands), for example, we see that more than half of all public spending goes to healthcare and social security, and another 12% goes to education. In short, taxation is mostly used to make healthcare affordable or to alleviate social determinants of mortality.
So no, I don’t think we can assume that taxation kills people.
People in poverty are mostly exempt from taxes
poverty kills people, and taxes take money from people
Looking at distributive effects is probably really important here. I can imagine that taxing people to the point that they enter poverty (as you suggested) makes things a lot worse for them. Most countries have some type of tax-free threshold under which you don’t have to pay income taxes. Low incomes are only taxed relatively little. Some taxes, like VAT on food, fall disproportionately on the poor since they spend a larger share of their income on food.
So, theoretically it’s possible that taxation causes poverty, and poverty causes deaths. But if we look at the top causes of global poverty, we see that poverty is mostly caused by things we can tackle by spending tax money: on safety nets and food programmes to stop hunger, on healthcare systems to improve access, on sanitation and clean water to improve hygiene and save time, on education to give kids a prosperous future, on infrastructure so that people can get to work, on creating jobs...
Summary
In summary, I’m in favour of researching the effects of taxation and public spending on mortality, but I expect the sign on most taxes to be negative (i.e. reducing mortality), at least when the tax incidence is not on people in poverty and public funds are spent on sensible projects. I think the method based on the VSL is probably not appropriate, but your proposal to have a government consider the effects of mortality makes sense since we can probably make a good guesstimate of the effects of a tax or government programme on social determinants of mortality.

Soemano Zeijlmans 26 Jan 2023 15:14 UTC
6 points
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in reply to: poppinfresh’s comment on: Could Degrowth be a Funding Opportunity Within the Climate Change Space?
While many industrialized economies have a lower carbon intensity than a few decades ago, what matters for climate change is not carbon intensity, but total cumulative emissions. Carbon intensity is an often used metric, but it is flawed for achieving climate change goals.
This is what degrowth advocates point out: a relative decoupling between GDP and greenhouse gas emissions can still lead to an increase in total emissions if GDP grows faster than carbon intensity shrinks. Even though there has been a 34% decrease in carbon intensity (CO2e/$) between 1965 and 2015, total emissions increased by 300%. To decrease carbon emissions, we would either need to (a) have absolute and strong decoupling between emissions and GDP and/or (b) reduce society’s dependence on GDP to flourish, at least temporarily. The former solution is often called ‘ecomodernism’, while the latter is ‘degrowth’ or ‘post-growth’. (Background info on decoupling here.)
Obviously, degrowth approaches, too, can have their drawbacks (e.g. lower tax revenues, typically lower tractability). But I would keep away from calling degrowth a “non-starter” and use the scout mindset to explore ideas within it. Personally, I wouldn’t support EA going all-in on the degrowth train, but there are probably worthwhile ideas and solutions coming from the degrowth economy that would otherwise be unlikely to get funding, as governments and companies have no incentive to advocate for degrowth. That’s worthwhile to explore!
Remember that OP did not argue that EA climate change funding should all go to degrowth approaches, but merely for “further exploration and research as to it’s [sic] viability as a funding opportunity”. That seems like a fair idea to me.