Carlos Barria/Reuters
Science in service of people and the planet.
The Union of Concerned Scientists is a member-supported nonprofit that’s fighting for a safer and healthier world.
Our work
Report
Power After the Storm
As climate change can exacerbate extreme events the need for science-based, proactive grid modernization is more pressing than ever.
Report
Data Center Power Play
Unmitigated data center growth puts the public at risk of higher utility bills and public health costs.
Video
UCS: What We Do
Breathtaking imagery from photographer Daniel Beltrá showcases the range of issues that UCS works on.
Report
Nuclear Weapons Without Limits?
Once the New START treaty expires in February 2026, there will be no limits on the number of strategic nuclear weapons the US and Russia can deploy.
How we work
Accomplishments
Trevor Tejeda-Gervais
Cleaner, More Affordable Power for Illinois
UCS championed legislation that will help Illinois achieve its clean electricity goals and boost energy affordability amid federal attacks on clean energy.