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What Mexico’s planned geoengineering restrictions mean for the future of the field

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What Mexico’s planned geoengineering restrictions mean for the future of the field


Luke Iseman, previously a director of hardware at Y Combinator and the cofounder of a geoengineering startup, says he added a few grams of sulfur dioxide into a pair of weather balloons and launched them from an unspecified site somewhere on the Mexican peninsula last spring. He says he intended for the balloons to reach the stratosphere and burst under pressure there, releasing the particles into the open air. 

Scientists believe that spraying sulfur dioxide or other reflective particles into the stratosphere in sufficient quantities might be able to offset some level of global warming, mimicking the cooling effect from major volcanic eruptions in the past. But it’s a controversial field, given the unknowns about potential side effects, fears that even discussing the possibility could undermine the urgency to address the root causes of climate change, and the difficult questions over how to govern a technology that has the power to tweak the temperature of the planet but could have sharply divergent regional effects. 

Iseman acknowledged to MIT Technology Review, and other outlets that reported on the effort, that he didn’t seek scientific or government approval before moving forward with the balloon launches. He subsequently cofounded the startup, Make Sunsets, to commercialize the concept. The company previously said it had raised around $750,000 in venture capital and planned to sell “cooling credits” for particles released during future balloon launches. 

But on January 13, Mexico’s Ministry of Environment and Natural Resources announced that the government will prohibit and, where appropriate, halt any solar geoengineering experiments within the country. The agency noted that Make Sunset’s launches were done without notice or consent. It said the prohibition was motivated by the risks of geoengineering, the lack of international agreements supervising such efforts, and the need to protect communities and the environment. 

Mexico may be one of the first nations, if not the first, to announce such an explicit  ban on experiments, although many nations have existing environmental regulations and other policies that could restrict certain practices. It’s not clear from the statement that all research in the field would be prohibited, which can also include modeling and lab work. The press release also says Mexico will stop any large-scale solar geoengineering practices, which may mean large experiments or full deployment of the technology.

Representatives from the Ministry of Environment and Natural Resources and the government of Baja California couldn’t be immediately reached for comment.

‘Indefinitely on hold’

Iseman, who didn’t respond to an inquiry from MIT Technology Review, told The Verge that future launches are “indefinitely on hold.” He said to the Wall Street Journal that he was “surprised by the speed and scope of the response” and had “expected and hoped for dialogue.”

But others weren’t surprised. Shuchi Talati, a scholar in residence at American University who is forming a nonprofit focused on governance and justice in solar geoengineering, warned in MIT Technology Review’s original piece that Make Sunsets’s actions could have a chilling effect on the field. She said the unauthorized effort could diminish government support for geoengineering research and amplify demands to restrict experiments.

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How do I know if egg freezing is for me?

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How do I know if egg freezing is for me?


The tool is currently being trialed in a group of research volunteers and is not yet widely available. But I’m hoping it represents a move toward more transparency and openness about the real costs and benefits of egg freezing. Yes, it is a remarkable technology that can help people become parents. But it might not be the best option for everyone.

Read more from Tech Review’s archive

Anna Louie Sussman had her eggs frozen in Italy and Spain because services in New York were too expensive. Luckily, there are specialized couriers ready to take frozen sex cells on international journeys, she wrote.

Michele Harrison was 41 when she froze 21 of her eggs. By the time she wanted to use them, two years later, only one was viable. Although she did have a baby, her case demonstrates that egg freezing is no guarantee of parenthood, wrote Bonnie Rochman.

What happens if someone dies with eggs in storage? Frozen eggs and sperm can still be used to create new life, but it’s tricky to work out who can make the decision, as I wrote in a previous edition of The Checkup.

Meanwhile, the race is on to create lab-made eggs and sperm. These cells, which might be made from a person’s blood or skin cells, could potentially solve a lot of fertility problems—should they ever prove safe, as I wrote in a feature for last year’s magazine issue on gender.

Researchers are also working on ways to mature eggs from transgender men in the lab, which could allow them to store and use their eggs without having to pause gender-affirming medical care or go through other potentially distressing procedures, as I wrote last year.

From around the web

The World Health Organization is set to decide whether covid still represents a “public health emergency of international concern.” It will probably decide to keep this status, because of the current outbreak in China. (STAT)  

Researchers want to study the brains, genes, and other biological features of incarcerated people to find ways to stop them from reoffending. Others warn that this approach is based on shoddy science and racist ideas. (Undark)

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A watermark for chatbots can expose text written by an AI

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The Download: watermarking AI text, and freezing eggs


For example, since OpenAI’s chatbot ChatGPT was launched in November, students have already started cheating by using it to write essays for them. News website CNET has used ChatGPT to write articles, only to have to issue corrections amid accusations of plagiarism. Building the watermarking approach into such systems before they’re released could help address such problems. 

In studies, these watermarks have already been used to identify AI-generated text with near certainty. Researchers at the University of Maryland, for example, were able to spot text created by Meta’s open-source language model, OPT-6.7B, using a detection algorithm they built. The work is described in a paper that’s yet to be peer-reviewed, and the code will be available for free around February 15. 

AI language models work by predicting and generating one word at a time. After each word, the watermarking algorithm randomly divides the language model’s vocabulary into words on a “greenlist” and a “redlist” and then prompts the model to choose words on the greenlist. 

The more greenlisted words in a passage, the more likely it is that the text was generated by a machine. Text written by a person tends to contain a more random mix of words. For example, for the word “beautiful,” the watermarking algorithm could classify the word “flower” as green and “orchid” as red. The AI model with the watermarking algorithm would be more likely to use the word “flower” than “orchid,” explains Tom Goldstein, an assistant professor at the University of Maryland, who was involved in the research. 

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The Download: watermarking AI text, and freezing eggs

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The Download: watermarking AI text, and freezing eggs


That’s why the team behind a new decision-making tool hope it will help to clear up some of the misconceptions around the procedure—and give would-be parents a much-needed insight into its real costs, benefits, and potential pitfalls. Read the full story.

—Jessica Hamzelou

This story is from The Checkup, MIT Technology Review’s weekly newsletter giving you the inside track on all things health and biotech. Sign up to receive it in your inbox every Thursday.

The must-reads

I’ve combed the internet to find you today’s most fun/important/scary/fascinating stories about technology.

1 Elon Musk held a surprise meeting with US political leaders 
Allegedly in the interest of ensuring Twitter is “fair to both parties.” (Insider $)
+ Kanye West’s presidential campaign advisors have been booted off Twitter. (Rolling Stone $)
+ Twitter’s trust and safety head is Musk’s biggest champion. (Bloomberg $) 

2 We’re treating covid like flu now
Annual covid shots are the next logical step. (The Atlantic $)

3 The worst thing about Sam Bankman-Fried’s spell in jail? 
Being cut off from the internet. (Forbes $)
+ Most crypto criminals use just five exchanges. (Wired $)
+ Collapsed crypto firmFTX has objected to a new investigation request. (Reuters)

4 Israel’s tech sector is rising up against its government
Tech workers fear its hardline policies will harm startups. (FT $)

5 It’s possible to power the world solely using renewable energy
At least, according to Stanford academic Mark Jacobson. (The Guardian)
+ Tech bros love the environment these days. (Slate $)
+ How new versions of solar, wind, and batteries could help the grid. (MIT Technology Review)

6 Generative AI is wildly expensive to run 
And that’s why promising startups like OpenAI need to hitch their wagons to the likes of Microsoft. (Bloomberg $)
+ How Microsoft benefits from the ChatGPT hype. (Vox)
+ BuzzFeed is planning to make quizzes supercharged by OpenAI. (WSJ $) 
+ Generative AI is changing everything. But what’s left when the hype is gone? (MIT Technology Review)

7 It’s hard not to blame self-driving cars for accidents
Even when it’s not technically their fault. (WSJ $)

8 What it’s like to swap Google for TikTok
It’s great for food suggestions and hacks, but hopeless for anything work-related. (Wired $)
+ The platform really wants to stay operational in the US. (Vox)
+ TikTok is mired in an eyelash controversy. (Rolling Stone $)

9 CRISPR gene editing kits are available to buy online
But there’s no guarantee these experiments will actually work. (Motherboard)
+ Next up for CRISPR: Gene editing for the masses? (MIT Technology Review)

10 Tech workers are livestreaming their layoffs
It’s a candid window into how these notoriously secretive companies treat their staff. (The Information $)

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