Delger Erdenesanaa
@edelger.bsky.social
Journalist | covering food, agriculture, water, pesticides and PFAS policy @cenmag.bsky.social | formerly at The New York Times, Texas Observer and Inside Climate News | Signal: edelger.10
Read my work: www.delgererdenesanaa.com
Read my work: www.delgererdenesanaa.com
Pinned
Delger Erdenesanaa
@edelger.bsky.social
· Sep 30
New job, new beat: I'm now covering PFAS, pesticides and other chemicals in food, ag and water for @cenmag.bsky.social. Would love to connect with sources -- please do reach out with tips (or just intros)!
My new email is D_Erdenesanaa at acs dot org. Signal remains edelger dot 10.
My new email is D_Erdenesanaa at acs dot org. Signal remains edelger dot 10.
Reposted by Delger Erdenesanaa
For his #PulitzerStaffPicks 2025, Mark Schulte, Director of U.S. Education and Outreach, selected "See How Marine Heat Waves Are Spreading Across the Globe" by @edelger.bsky.social for The @nytimes.com.
👉 bit.ly/YIStories25
👉 bit.ly/YIStories25
December 12, 2025 at 6:34 PM
For his #PulitzerStaffPicks 2025, Mark Schulte, Director of U.S. Education and Outreach, selected "See How Marine Heat Waves Are Spreading Across the Globe" by @edelger.bsky.social for The @nytimes.com.
👉 bit.ly/YIStories25
👉 bit.ly/YIStories25
Reposted by Delger Erdenesanaa
For @cenmag.bsky.social, I tried to summarize what happened in science policy in 2025. Spoiler: A lot!
Thanks to Ian Banks, @jeremymberg.bsky.social, Arthur Daemmrich, @cdelawalla.bsky.social and @ucs.org Jen Jones for their insights.
Out soon: what to expect in 2026
cen.acs.org/policy/nih-n...
Thanks to Ian Banks, @jeremymberg.bsky.social, Arthur Daemmrich, @cdelawalla.bsky.social and @ucs.org Jen Jones for their insights.
Out soon: what to expect in 2026
cen.acs.org/policy/nih-n...
‘A huge rupture in everything’: US science faced major upheaval in 2025
Amid enormous shifts, many scientists pushed back and risked dismissal from their jobs even as federal agencies fired thousands of employees
cen.acs.org
December 10, 2025 at 3:27 PM
For @cenmag.bsky.social, I tried to summarize what happened in science policy in 2025. Spoiler: A lot!
Thanks to Ian Banks, @jeremymberg.bsky.social, Arthur Daemmrich, @cdelawalla.bsky.social and @ucs.org Jen Jones for their insights.
Out soon: what to expect in 2026
cen.acs.org/policy/nih-n...
Thanks to Ian Banks, @jeremymberg.bsky.social, Arthur Daemmrich, @cdelawalla.bsky.social and @ucs.org Jen Jones for their insights.
Out soon: what to expect in 2026
cen.acs.org/policy/nih-n...
Reposted by Delger Erdenesanaa
For her second #PulitzerStaffPicks selection, Ocean Editor Jessica Aldred chose @katiemcque.bsky.social’s story “'I’ve Seen Hell': Inside the Global Crisis of Seafarer Exploitation” published in @contextnewsroom.bsky.social.
👉 bit.ly/YIStories25
👉 bit.ly/YIStories25
December 12, 2025 at 2:45 PM
For her second #PulitzerStaffPicks selection, Ocean Editor Jessica Aldred chose @katiemcque.bsky.social’s story “'I’ve Seen Hell': Inside the Global Crisis of Seafarer Exploitation” published in @contextnewsroom.bsky.social.
👉 bit.ly/YIStories25
👉 bit.ly/YIStories25
Reposted by Delger Erdenesanaa
Entangled examined the threats to North Atlantic right whales & the policies to address them. Now, as the series closes, we return to the people working to change the outcome: www.theglobeandmail.com/canada/artic...
@pulitzercenter.org @theglobeandmail.com
@pulitzercenter.org @theglobeandmail.com
Showing humanity to endangered North Atlantic right whales pays off
From the ocean to the classroom, from Atlantic Canada to the U.S. South, these people are finding ways to save a species before it vanishes
www.theglobeandmail.com
December 5, 2025 at 5:42 PM
Entangled examined the threats to North Atlantic right whales & the policies to address them. Now, as the series closes, we return to the people working to change the outcome: www.theglobeandmail.com/canada/artic...
@pulitzercenter.org @theglobeandmail.com
@pulitzercenter.org @theglobeandmail.com
Reposted by Delger Erdenesanaa
The United Nations effort to negotiate a treaty on plastic pollution appears to be at a standstill. The parties’ approach needs to change if a treaty is to be reached. But how? cen.acs.org/environment/... #chemsky 🧪
The UN plastics treaty is at an impasse. Can it reset?
Significant disputes remain about the scope of any treaty, but everyone agrees that negotiations can’t continue as they have been
cen.acs.org
December 7, 2025 at 10:29 AM
The United Nations effort to negotiate a treaty on plastic pollution appears to be at a standstill. The parties’ approach needs to change if a treaty is to be reached. But how? cen.acs.org/environment/... #chemsky 🧪
Reposted by Delger Erdenesanaa
Advisory panel on vaccine policy in the US votes to scrap recommendation of #hepatitisB vaccination for newborns. One panel member called decision "unconscionable"
@maxhenrybarnhart.bsky.social for @cenmag.bsky.social
cen.acs.org/pharmaceutic...
@maxhenrybarnhart.bsky.social for @cenmag.bsky.social
cen.acs.org/pharmaceutic...
CDC panel ends a long-standing recommendation for hepatitis B vaccines for newborns
The change has no scientific basis, critics say
cen.acs.org
December 5, 2025 at 9:47 PM
Advisory panel on vaccine policy in the US votes to scrap recommendation of #hepatitisB vaccination for newborns. One panel member called decision "unconscionable"
@maxhenrybarnhart.bsky.social for @cenmag.bsky.social
cen.acs.org/pharmaceutic...
@maxhenrybarnhart.bsky.social for @cenmag.bsky.social
cen.acs.org/pharmaceutic...
Reposted by Delger Erdenesanaa
Boy, retraction is the thing these days. After years of critique, a foundational 25-year old paper on the safety of glyphosate herbicide has been pulled. www.sciencedirect.com/science/arti... 1/2
December 3, 2025 at 3:58 PM
Boy, retraction is the thing these days. After years of critique, a foundational 25-year old paper on the safety of glyphosate herbicide has been pulled. www.sciencedirect.com/science/arti... 1/2
Reposted by Delger Erdenesanaa
So, remember that MAHA summit 2 weeks ago that @statnews.com broke the news of and @maxkozlov.bsky.social somehow got into for Nature, even though it was closed to the press?
The organizers posted the entire 6.5-hour conference proceedings to YouTube last week.
cen.acs.org/policy/MAHA-...
The organizers posted the entire 6.5-hour conference proceedings to YouTube last week.
cen.acs.org/policy/MAHA-...
At MAHA Summit, the NIH head pushes for research that risks failure
And 4 other takeaways for life scientists from the ‘off-the-record’ Make America Healthy Again conference
cen.acs.org
November 26, 2025 at 3:58 PM
So, remember that MAHA summit 2 weeks ago that @statnews.com broke the news of and @maxkozlov.bsky.social somehow got into for Nature, even though it was closed to the press?
The organizers posted the entire 6.5-hour conference proceedings to YouTube last week.
cen.acs.org/policy/MAHA-...
The organizers posted the entire 6.5-hour conference proceedings to YouTube last week.
cen.acs.org/policy/MAHA-...
Reflections on COP30 now that it's over. (Or is it??) First, idk if this was Lula's goal, but the physical chaos of the venue—fire, deluge, diesel fumes—sure seemed like a metaphor for climate change to me.
cen.acs.org/environment/...
cen.acs.org/environment/...
COP30 final agreement omits fossil fuels
Countries also left deforestation on the sidelines but agreed to more funding for climate adaptation efforts by low-income countries
cen.acs.org
November 25, 2025 at 6:45 PM
Reflections on COP30 now that it's over. (Or is it??) First, idk if this was Lula's goal, but the physical chaos of the venue—fire, deluge, diesel fumes—sure seemed like a metaphor for climate change to me.
cen.acs.org/environment/...
cen.acs.org/environment/...
The chemical industry is a huge source of GHG emissions. Decarbonizing the industry will be hard, but as a UNFCCC technology expert said here, there's no way we can avoid it. COP30 reflected that, with what seemed to be more spotlight on chemicals than past summits. cen.acs.org/environment/...
At COP30, chemical companies push biobased climate solutions
But environmentalists are raising concerns about the ecosystem, food security, and other impacts from the fossil fuel alternative
cen.acs.org
November 21, 2025 at 6:47 PM
The chemical industry is a huge source of GHG emissions. Decarbonizing the industry will be hard, but as a UNFCCC technology expert said here, there's no way we can avoid it. COP30 reflected that, with what seemed to be more spotlight on chemicals than past summits. cen.acs.org/environment/...
Reposted by Delger Erdenesanaa
Nov. 14 Policy Watch: US government reopens, is absent from COP 30 climate conference
In other news, the EPA wants to trim PFAS reporting requirements and is pushing back compliance dates for parts of its TCE and methylene chloride rules. cen.acs.org/policy/Nov-1...
In other news, the EPA wants to trim PFAS reporting requirements and is pushing back compliance dates for parts of its TCE and methylene chloride rules. cen.acs.org/policy/Nov-1...
Nov. 14 Policy Watch: US government reopens, is absent from COP 30 climate conference
In other news, the EPA wants to trim PFAS reporting requirements and is pushing back compliance dates for parts of its TCE and methylene chloride rules
cen.acs.org
November 15, 2025 at 11:06 AM
Nov. 14 Policy Watch: US government reopens, is absent from COP 30 climate conference
In other news, the EPA wants to trim PFAS reporting requirements and is pushing back compliance dates for parts of its TCE and methylene chloride rules. cen.acs.org/policy/Nov-1...
In other news, the EPA wants to trim PFAS reporting requirements and is pushing back compliance dates for parts of its TCE and methylene chloride rules. cen.acs.org/policy/Nov-1...
Tomorrow at #COP30 I'll be discussing what I learned from my recent @pulitzercenter.org reporting on marine heatwaves and their effects on wildlife and fisheries -- 1:30pm Brazil time at the Ocean Pavilion, alongside fishermen & women, scientists, and policymakers.
🎣 How can fisheries adapt to a changing climate? Scripps PhD candidate Max Titcomb joins this #OceanPavilion panel to discuss the impacts of overfishing and marine heatwaves, as well as solutions to build climate-resilient fisheries. #COP30
📆 Nov 15
🔗 https://bit.ly/4nLxq3i
📆 Nov 15
🔗 https://bit.ly/4nLxq3i
November 14, 2025 at 5:10 PM
Tomorrow at #COP30 I'll be discussing what I learned from my recent @pulitzercenter.org reporting on marine heatwaves and their effects on wildlife and fisheries -- 1:30pm Brazil time at the Ocean Pavilion, alongside fishermen & women, scientists, and policymakers.
Rescheduled for this morning 8 am - if you are in the Blue Zone, come by the Ocean Pavilion and learn about the links between rainforest and ocean to start your day.
The Amazon and the ocean are deeply connected, yet this link is underreported.
Join us this afternoon, for a conversation that brings together journalists, researchers, and educators exploring how these ecosystems shape our future.
Register now!
👉 bit.ly/30COPsesh
Join us this afternoon, for a conversation that brings together journalists, researchers, and educators exploring how these ecosystems shape our future.
Register now!
👉 bit.ly/30COPsesh
November 14, 2025 at 10:55 AM
Rescheduled for this morning 8 am - if you are in the Blue Zone, come by the Ocean Pavilion and learn about the links between rainforest and ocean to start your day.
The best news from #COP30 so far is that a couple got engaged last night during dinner at a restaurant just outside the venue. It was packed with conference attendees and decidedly not the most romantic ambiance… but good for them!!
November 12, 2025 at 1:44 PM
The best news from #COP30 so far is that a couple got engaged last night during dinner at a restaurant just outside the venue. It was packed with conference attendees and decidedly not the most romantic ambiance… but good for them!!
I’m in Belém covering #COP30. It’s a difficult geopolitical—and physical—context, as the planet begins to breach the 1.5C goal set 10 years ago and the US withdraws once again from the Paris Agreement. I’ll be continuing coverage throughout the conference, so please reach out if you’d like to talk.
Diplomats from nearly 200 countries, as well as tens of thousands of observers, are gathering in Belém, Brazil, from Nov. 10 to 21 for the annual United Nations climate summit. cen.acs.org/policy/COP30... #chemsky 🧪
As COP30 begins, countries face ‘hard truth’ of 1.5 °C global warming
The average global surface temperature passed a key threshold last year. Meanwhile, the US does not have an official delegation at the UN climate conference now underway in Brazil
cen.acs.org
November 10, 2025 at 7:45 PM
I’m in Belém covering #COP30. It’s a difficult geopolitical—and physical—context, as the planet begins to breach the 1.5C goal set 10 years ago and the US withdraws once again from the Paris Agreement. I’ll be continuing coverage throughout the conference, so please reach out if you’d like to talk.
Reposted by Delger Erdenesanaa
Not since 1935 has anyone experienced a storm like Melissa. Melissa's record wouldn't have happened without climate change, which made the hurricane's winds about 10 mph stronger, according to a rapid attribution analysis by Climate Central. yaleclimateconnections.org/2025/10/cata...
Catastrophic Hurricane Melissa hits Jamaica as the strongest landfalling Atlantic hurricane on record » Yale Climate Connections
At landfall in western Jamaica, Melissa’s 185 mph winds and 892 mb pressure tied with the Labor Day Hurricane of 1935 in the Florida Keys as the strongest on record for the Atlantic.
yaleclimateconnections.org
October 28, 2025 at 6:53 PM
Not since 1935 has anyone experienced a storm like Melissa. Melissa's record wouldn't have happened without climate change, which made the hurricane's winds about 10 mph stronger, according to a rapid attribution analysis by Climate Central. yaleclimateconnections.org/2025/10/cata...
Reposted by Delger Erdenesanaa
A team of international scientists suggests that ignoring plankton could lead scientists to underestimate how the ocean will respond to climate change. Read more: cen.acs.org/environment/...
#CENChemPics #chemsky 🧪
#CENChemPics #chemsky 🧪
October 28, 2025 at 4:00 PM
A team of international scientists suggests that ignoring plankton could lead scientists to underestimate how the ocean will respond to climate change. Read more: cen.acs.org/environment/...
#CENChemPics #chemsky 🧪
#CENChemPics #chemsky 🧪
Yes, there's lead in protein powders. No, there's no known safe level. But, exposure to trace amounts is inevitable, especially since plants naturally take up lead from the environment. And, people disagree on standards for manufacturers. Latest @cenmag.bsky.social: cen.acs.org/food/food-in...
Why scientists found lead in protein powders
Consumers shouldn't panic
cen.acs.org
October 27, 2025 at 8:22 PM
Yes, there's lead in protein powders. No, there's no known safe level. But, exposure to trace amounts is inevitable, especially since plants naturally take up lead from the environment. And, people disagree on standards for manufacturers. Latest @cenmag.bsky.social: cen.acs.org/food/food-in...
Reposted by Delger Erdenesanaa
It's been a big year for chemists trying to turn PTFE (better know as Teflon) into something that won't hang out in a landfill for 1,000 years. The latest development in this area uses chunks of sodium metal. My latest for @cenmag.bsky.social
cen.acs.org/materials/po...
cen.acs.org/materials/po...
This reaction turns Teflon into toothpaste’s key ingredient
Grinding PTFE with chunks of sodium metal creates sodium fluoride in a solvent-free reaction that aims to avoid landfills
cen.acs.org
October 27, 2025 at 7:46 PM
It's been a big year for chemists trying to turn PTFE (better know as Teflon) into something that won't hang out in a landfill for 1,000 years. The latest development in this area uses chunks of sodium metal. My latest for @cenmag.bsky.social
cen.acs.org/materials/po...
cen.acs.org/materials/po...
Our first weekly briefing of chemistry policy news @cenmag.bsky.social. In food world, companies and trade groups formed a supergroup called Americans for Ingredient Transparency to lobby Congress to preempt state laws on food additives and other MAHA-inspired issues: cen.acs.org/policy/Oct-2...
Oct. 24 Policy Watch: Schools reject White House ‘compact’
In other news, EPA launches a new research office and NGOs sue the Trump administration over air pollution exemptions
cen.acs.org
October 24, 2025 at 6:03 PM
Our first weekly briefing of chemistry policy news @cenmag.bsky.social. In food world, companies and trade groups formed a supergroup called Americans for Ingredient Transparency to lobby Congress to preempt state laws on food additives and other MAHA-inspired issues: cen.acs.org/policy/Oct-2...
Reposted by Delger Erdenesanaa
A 2023 marine heat wave in the central Red Sea caused 100% of monitored sea anemones to bleach, followed by the death of 94-100% of clownfish and 66-94% of the anemones across three surveyed reefs.
The findings challenge the belief that Red Sea marine life would be protected from climate change.
The findings challenge the belief that Red Sea marine life would be protected from climate change.
Losing Nemo: In the Red Sea, clownfish vanish as anemones bleach
When Morgan Bennett-Smith descended to a familiar reef in the central Red Sea in September 2023, he expected to find the same tagged anemones and resident clownfish he had been monitoring for months.…
news.mongabay.com
October 16, 2025 at 4:14 PM
A 2023 marine heat wave in the central Red Sea caused 100% of monitored sea anemones to bleach, followed by the death of 94-100% of clownfish and 66-94% of the anemones across three surveyed reefs.
The findings challenge the belief that Red Sea marine life would be protected from climate change.
The findings challenge the belief that Red Sea marine life would be protected from climate change.
New Mexico is proposing warning labels for #PFAS across a wide range of consumer products starting next year, similar to California's Prop 65 labels. This is part of the rule-making for a new law that also phases out many products with PFAS. More in @cenmag.bsky.social: cen.acs.org/policy/New-M...
New Mexico proposes world’s broadest use of PFAS warning labels
The state’s proposed requirements have not been done anywhere else and stem from a 2025 law that also outlaws PFAS in certain products
cen.acs.org
October 14, 2025 at 6:19 PM
New Mexico is proposing warning labels for #PFAS across a wide range of consumer products starting next year, similar to California's Prop 65 labels. This is part of the rule-making for a new law that also phases out many products with PFAS. More in @cenmag.bsky.social: cen.acs.org/policy/New-M...
My first foray into food chemicals -- which I'm learning is a busy, busy beat right now, especially at the state level
West Virginia enacted the US’s first broad ban on synthetic food dyes in March. On Monday, an industry group filed the first lawsuit seeking to overturn the ban. cen.acs.org/policy/West-...
West Virginia’s sweeping food dye ban faces its first lawsuit
The International Association of Color Manufacturers is asking a federal court to strike down the state’s groundbreaking recent action against several synthetic food dyes
cen.acs.org
October 13, 2025 at 7:21 PM
My first foray into food chemicals -- which I'm learning is a busy, busy beat right now, especially at the state level
My new colleagues really commit to the bit
Once you get dengue fever, you're at a much greater risk of severe disease if you ever get it again due to something called antibody dependent enhancement.
So why did I choose to purposely be infected with dengue?
Read my latest for @cenmag.bsky.social to find out. I'm quite proud of this one.
So why did I choose to purposely be infected with dengue?
Read my latest for @cenmag.bsky.social to find out. I'm quite proud of this one.
I was injected with dengue virus to learn about clinical trials
I became a test subject in a clinical trial for a new dengue treatment. Here’s what I discovered
cen.acs.org
October 13, 2025 at 7:16 PM
My new colleagues really commit to the bit
New job, new beat: I'm now covering PFAS, pesticides and other chemicals in food, ag and water for @cenmag.bsky.social. Would love to connect with sources -- please do reach out with tips (or just intros)!
My new email is D_Erdenesanaa at acs dot org. Signal remains edelger dot 10.
My new email is D_Erdenesanaa at acs dot org. Signal remains edelger dot 10.
September 30, 2025 at 4:41 PM
New job, new beat: I'm now covering PFAS, pesticides and other chemicals in food, ag and water for @cenmag.bsky.social. Would love to connect with sources -- please do reach out with tips (or just intros)!
My new email is D_Erdenesanaa at acs dot org. Signal remains edelger dot 10.
My new email is D_Erdenesanaa at acs dot org. Signal remains edelger dot 10.