Union of Concerned Scientists
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Union of Concerned Scientists
@ucs.org
35K followers 1.3K following 1.8K posts
The Union of Concerned Scientists puts rigorous, independent science to work to solve our planet's most pressing problems.

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ucs.org
Yesterday, the Clean and Reliable Grid Affordability (CRGA) Act was signed into law 🎉. UCS’s James Gignac and other members of the Illinois Clean Jobs Coalition joined @govpritzker.illinois.gov to celebrate Illinois’ clean energy leadership.
"Members of the Illinois Clean Jobs Coalition and Gov. Pritzker celebrating Illinois' clean energy leadership".
January 9, 2026 at 10:03 PM
ucs.org
The authoritarian, violent, and anti-science actions of the Trump admin over the past week show clear contempt for democracy and the public good, endangering people in the US and around the world.

Congress must uphold its constitutional responsibility and hold the administration accountable.
January 9, 2026 at 4:25 PM
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CRGA is law!🎉 Today, @govpritzker.illinois.gov signed the Clean and Reliable Grid Affordability (CRGA) Act into law, officially cementing Illinois as the state with the STRONGEST response yet to the rollback of federal climate protections.
January 9, 2026 at 12:00 AM
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We are proud to celebrate our 2025 Science Defenders! Meet Neighbors for Environmental Justice (N4EJ), a group that has been working since 2018 to educate, advocate, and organize with the community to advance environmental justice on the southwest side of Chicago.
Photo of advocacy group Neighbors for Environmental Justice, one of 2025 UCS Science Defenders.
December 30, 2025 at 2:47 PM
ucs.org
It’s December, and we’re honoring UCS’s 2025 Science Defenders! Meet Dr. Yanelli Nunez, a senior scientist at PSE Healthy Energy, who provides data and analysis to help empower communities, amplify their voices, and work toward a healthier energy future.
Photo of Dr. Yanelli Nunez, one of UCS's 2025 Science Defenders
December 26, 2025 at 2:39 PM
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What’s the relationship between winter weather & climate change? It starts with the polar vortex. UCS's @marc-alessi.bsky.social breaks it down for you.

This holiday season, show some love to your local meteorologists and support science and scientific funding.
December 22, 2025 at 7:13 PM
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It has not been an easy year for science, but there are bright spots worth celebrating. We are honoring our 2025 #ScienceDefenders, inspiring people using science to help communities and protect it from political or other interference.

Meet Katelyn Jetelina, founder of Your Local Epidemiologist.
Meet Katelyn Jetelina, founder of Your Local Epidemiologist.
December 18, 2025 at 5:28 PM
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Yesterday, Rep. @joeneguse.bsky.social joined us via Zoom at #AGU25 to reject the Trump admin’s proposal to dismantle the Ntl. Center for Atmospheric Research (NCAR), one of the US’ leading weather & climate research institutions.
Urge Congress to halt this dangerous action: act.ucsusa.org/4oWtCwz
December 18, 2025 at 4:17 PM
ucs.org
The Trump admin intends to dismantle the National Science Foundation National Center for Atmospheric Research (NCAR), one of the US' leading weather and climate research institutions.

We must urge Congress to halt this dangerous action immediately.

🔗Take action: act.ucsusa.org/4oWtCwz
December 17, 2025 at 8:54 PM
ucs.org
The Arctic is warming nearly four times than the world average. Record loss of sea-ice, loss of snow cover, increase in precipitation, greening of the tundra and rusting of rivers are among the observed trends.
Infographic showing Arctic wide climate highlights for 2025, including record warm temperatures, record low sea ice extent, extreme precipitation, glacier thinning, and widespread impacts across the Arctic Ocean, Greenland, Alaska, Canada, and Russia.
December 16, 2025 at 6:07 PM
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Happening TODAY!

UCS invites you to join a powerful panel on perspectives, lessons, and leadership from fenceline communities in Louisiana, during #AGU25 week.

Join us for free food & drinks + a thoughtful conversation on science advocacy!

🗓️ Dec 16, 6pm CT.

🔗 Info + RSVP: act.ucsusa.org/3KOA5vK
Graphic promoting AGU25 showing a plate of oysters being shared at a table, with text reading “Come for the oysters. Stay for the science.” Union of Concerned Scientists logo included.
December 16, 2025 at 4:28 PM
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Applications are still open! The Science for Public Good Fund offers up to $1500 to support community-driven science advocacy projects. From workshops to local campaigns, you can help spark change. Apply here now: act.ucsusa.org/3KVR9Qo
December 15, 2025 at 4:15 AM
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It’s been a rough year for science. But bright spots remain! We’re honoring our 2025 Science Defenders: people who use science to improve the world, taking a stand to protect science from political or other interference.

First up: Dr. Marc Alessi from the Weather & Climate Livestream team!
Marc Alessi of the Weather and Climate Livestream Team, honored as a 2025 Science Defender for organizing against funding cuts.
December 11, 2025 at 5:24 PM
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The Trump administration has given free rein to some of the most polluting industries in the country. We created an interactive map showing 546 industrial sites across the US and Puerto Rico deemed eligible for exemptions from their Clean Air Act requirements. #DirtyDeeds (🧵)
December 10, 2025 at 5:19 PM
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A federal court ruled that the Trump administration must release records tied to the secretly formed Climate Working Group (CWG), which produced a widely discredited report now central to attacks on U.S. climate efforts.

Read UCS & @envdefensefund.bsky.social statement:

🔗 act.ucsusa.org/4rOlZej
A graphic featuring the White House in the background under a blue-tinted filter. Large white text centered on the image reads: “THE WHITE HOUSE SHAM CLIMATE REPORT COVERUP.” Below the text are three small triangular arrows pointing downward. At the bottom, the Union of Concerned Scientists logo appears. A small photo credit reads: “Photo: René DeAnda/Unsplash © 2025 Union of Concerned Scientists.” A federal court ruled in a hearing today that the Trump administration must release records related to the Climate Working Group (CWG)—the secretly created group that wrote a widely-discredited report now at the center of administration attacks on U.S. efforts to address climate change and the damage it is doing across the country. "The Trump administration has essentially acknowledged that they didn’t follow the law when commissioning a secret committee process to draft their sham report aimed at undermining the Endangerment Finding,” said UCS President and CEO Dr. Gretchen Goldman.
December 9, 2025 at 10:07 PM
ucs.org
Key US climate change indicators were also scrubbed from EPA webpages, including data and maps on changes in temperature, drought, and heavy precipitation over the last few decades. These webpages can be found on Wayback Machine:

web.archive.org/web/20251004...
Screenshot of the EPA website showing the "Climate Change Indicators: U.S. and Global Temperature" page. The page header includes the EPA logo and navigation menu. The main content displays the title, a brief description of temperature trends, and tabs linking to figures on U.S. temperatures, global temperatures, and rate of change. Below, a large chart shows rising temperature anomalies in the contiguous United States from 1901 to 2023. A Wayback Machine banner appears at the top, indicating the page was archived.
December 9, 2025 at 8:23 PM
ucs.org
UCS, @weact4ej.bsky.social and Louisiana community leaders invite you to join a powerful toxic tour exploring the realities of environmental injustice in the Gulf South.

Join this IN-PERSON event on Sunday, December 14, 1pm CT.

🔗Info + RSVP: act.ucsusa.org/4pqlo13
The Union of Concerned Scientists (UCS), WE ACT for Environmental Justice, and Louisiana community leaders invite you to join a powerful toxic tour exploring the realities of environmental injustice in the Gulf South. Hosted in partnership with Healthy Gulf, the tour will take participants to fenceline communities impacted by industrial pollution and ongoing restoration efforts. Date: Sunday, December 14 Time: 1:00–5:00 p.m. CT (depart near the Ernest N. Morial Convention Center, return by no later than 6:00 p.m.) Location: Greater New Orleans region (route in collaboration with Healthy Gulf and local EJ partners)
December 8, 2025 at 5:17 PM
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We won’t let science be silenced – ACT NOW. UCS needs urgent support to continue leading the charge to defend science, our planet, and our communities.

💝Give before 11:59 pm TONIGHT.

Donate: act.ucsusa.org/Giving2025

#GivingTuesday
Two scientists sit outdoors in a wooded area examining equipment and notes. Text overlay reads “The scientific community is stronger together” with a button saying “Make my 3X match gift.” Logo of the Union of Concerned Scientists appears at the bottom.
December 3, 2025 at 9:01 PM
ucs.org
Hey Michiganders! We hope to see you next Wednesday, December 10, for a community solar-focused lobby day in Lansing!

#CommunitySolar #CleanEnergyForAll

Sign up here: act.ucsusa.org/4rzFg3b
Graphic promoting “Community Solar Lobby Day” on December 10 at 9:00 AM at Central United Methodist Church in Lansing. The image shows illustrated houses with solar panels, trees, and electrical icons, along with logos of supporting organizations such as Vote Solar, Ecology Center, Michigan Climate Action Network, Sierra Club, and the Union of Concerned Scientists.
December 3, 2025 at 6:48 PM
ucs.org
🔬✨Science advocacy takes many forms: a local talk, event on campus, a toolkit, collaboration with a community group, and more! Let us help fund your advocacy efforts.

Apply for up to $1500 here:

🔗 act.ucsusa.org/4iAEiiT
December 3, 2025 at 5:28 PM
ucs.org
There are just a few hours left of #GivingTuesday! It's up to us to protect science and democracy to build the future we deserve. Join forces with other science advocates and multiply your impact.⁠
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💝Give before midnight.

Donate: act.ucsusa.org/Giving2025
Union of Concerned Scientists ad, with the message "This is a Science Emergency"
December 2, 2025 at 10:15 PM
ucs.org
It’s #GivingTuesday! UCS needs urgent support to continue leading the charge to defend science, our planet, and our communities. With 500+ documented attacks on science this year alone, this work is more important than ever.

💝Give before midnight.

Donate: act.ucsusa.org/Giving2025
A Giving Tuesday ad with a scientist checking the quality of water, next to a river, with the message "The Scientific Community is Stronger Together". The message invites to match 3x gift because of Giving Tuesday.
December 2, 2025 at 5:01 PM
ucs.org
This #GivingTuesday, UCS needs urgent support to continue leading the charge to defend science, our planet, and our communities. Make a gift before midnight on December 2nd, and your gift will count toward a 3X match campaign, up to $250,000.

Donate: act.ucsusa.org/Giving2025
December 1, 2025 at 7:31 PM
ucs.org
Strong employee experience practices boost satisfaction, prevent burnout and build a motivated, equity-centered workforce. Join @green2-0.bsky.social and leaders including UCS’s president @gretchentg.bsky.social to discuss strengthening our sector.

Register: us02web.zoom.us/webinar/regi...
Graphic for a Green 2.0 event titled “Building a Resilient Environmental Movement through Best Practices,” scheduled for Wednesday, December 9, 2025, 1–2 PM ET. Includes headshots of speakers Dr. Gretchen Goldman, Rory Muhammad, Whitney Herrington, Iris Zhan, Andrea Akall’eq Burgess, and Michelle Gin, with illustrated people working at laptops along the bottom.
December 1, 2025 at 3:33 PM
ucs.org
See more of award-winning photographer Daniel Beltrá’s work: www.danielbeltra.com and on Instagram: @danielbeltraphoto
Frontpage of photographer Daniel Beltra's website.
November 26, 2025 at 2:52 PM