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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
Podcast
Destroyer of Worlds
Jess speaks with Oppenheimer biographer Kai Bird about one of Earth's most influential humans and his scientific and political legacies.
Feature
Danger Season 2023
This tool, updated daily, shows how many people across the United States face risks right now from climate impacts.
Explainer
Each Country's Share of CO2 Emissions
Which 20 countries emit the most carbon dioxide? The wealthiest.
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
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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.