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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
Video
The Case Against ExxonMobil, Chevron, and other Fossil Fuel Companies
Across the world, fossil fuel companies face a wave of new lawsuits for their role in the climate crisis.
Report
Data Centers in California
What will the impacts of data centers be on the state’s electricity system and its ratepayers?
Feature
UCS vs Anti-Science Actions
We're suing the Trump administration on a wide range of issues—and winning.
Video
UCS: What We Do
Breathtaking imagery from photographer Daniel Beltrá showcases the range of issues that UCS works on.
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.