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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
Explainer
Water, Wildfire, and Climate Change
Fires across the West, and particularly in California, are threatening the availability and quality of water for millions of people.
Feature
Danger Season 2023
This tool, updated daily, shows how many people across the United States face risks right now from climate impacts.
Podcast
The New Dark Ages
Jess speaks with Rhode Island Senator Sheldon Whitehouse about the influence of fossil fuel dark money in politics today.
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.