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We use science to make change happen.
The Union of Concerned Scientists is a member-supported nonprofit that’s fighting for a safer and healthier world.
Our work
Video
The Infuriating Link Between Wildfires and Fossil Fuel Companies
Groundbreaking science shows how oil and gas companies bear at least some responsibility for worsening forest fires.
Feature
Danger Season 2023
This tool, updated daily, shows how many people across the United States face risks right now from climate impacts.
Podcast
Fear in a Handful of Dust
Exciting new research allows UCS scientists to gain insight into North Korea’s shadowy nuclear weapons program.
Report
Lost Inheritance
Unless the legal issue known as heirs' property is resolved, Black farmers will continue to lose their land.
How we work
Accomplishments
Jonathan Schmer/Pexels
Cleaner Air in California as Trucks Rule Passes
UCS analysis and advocacy helped shape, strengthen, and pass a CA rule requiring large fleets of commercial trucks, delivery vans, and buses to transition to zero-emission vehicles by 2036—a huge win for cleaner air and reducing global warming emissions.