Reports

We quantified Californians' exposure to dangerous air pollution. Particulate matter disproportionately affects Californians of color and low-income communities.

The Trump administration's pattern of undermining science is damaging our health and safety. Scientists and their allies are pushing back—and Congress should join them.

The United States missile defense system hasn’t shown that it can successfully deal with decoys or other countermeasures.

A no-first-use policy—in which the United States declares it will never use nuclear weapons first—would remove the ability of the United States to start a nuclear war, increasing global security.

Heavy duty vehicles play a major role in our everyday lives—but their pollutants pose many health risks.

UCS outlined 10 key strategies that state legislators, regulators, and other stakeholders can follow.

Interior Secretary Ryan Zinke and his political appointees have overseen relentless attacks on science and put our nation's parks, health, and wildlife at risk.

The W76-2 warhead is both unnecessary and dangerous. The United States already has weapons capable of similar yields; adding another will introduce complications that could lead to miscalculations.

The faster that Illinois can retire its aging, inefficient coal plants, the better.

An in-depth analysis of eight major fossil fuel companies finds they continue to spread climate disinformation and have failed to adequately plan their businesses for a low-carbon world.

Reducing transportation emissions will bring dramatic financial, environmental, and health benefits.

More than one-third of US nuclear plants are unprofitable or scheduled to close. If they’re replaced by natural gas, emissions will rise—with serious consequences for the climate.