Action Alert: Take a Stand Against Unchecked Data Center Development

Healthier Future for Wisconsin

Bold Action for a
Cleaner Wisconsin

Your Environmental Voice Since 1970

Since 1970, we’ve defended Wisconsin’s air, water, and land with bold action. From landmark legal wins to groundbreaking research, we turn environmental challenges into lasting progress.

Science & Analysis

We’re not just advocates—we’re experts. As the only environmental group in Wisconsin with a dedicated science team, we have the knowledge and credibility to fight smarter and win bigger. Backed by research and legal expertise, we turn advocacy into impact.

Leading with Science

Legal Action

For decades our legal team has fought and won high-impact cases to protect Wisconsin’s air, water, and natural places—from curbing agricultural runoff to challenging weak air pollution permits. When policy fails, we use the power of the courts to defend the environment and public health.

Defending Wisconsin’s Environment

Policy Advocacy

We work with lawmakers, agencies, and communities to advance environmental policies that protect Wisconsin’s air, water, land, and climate—guided by science and driven by our shared vision for a clean Wisconsin.

Shaping Policy

Community Engagement

From severe storms to smoke-filled skies, climate change is already affecting communities across Wisconsin. Clean Wisconsin partners with local governments and community organizations to prepare for extreme weather, reduce pollution, and build long-term resilience—starting with the people most impacted.

Community Engagement in Action

Amplifying Your Voice

Real change starts with people who speak up. Clean Wisconsin helps people across the state take meaningful action—whether it’s contacting legislators, attending hearings, or organizing in their communities to protect our air, water, and climate.

Amplifying Your Voice

The Experts Behind the Advocacy

It takes more than passion to protect Wisconsin’s environment—it takes knowledge, strategy, and experience. Our team of scientists, attorneys, policy experts, and advocates works every day to defend our state’s air, water, and land.

Meet the Entire Team

Updates from the Front Lines

New Analysis: Data Center Water Consumption Will Be Far Higher Than Tech Companies Claim

When water use at power plants is accounted for, one AI data center could use more water than an entire Wisconsin city.

See News
Hands under faucet

Latest News

A splash of color: Transforming green infrastructure in Milwaukee

A new partnership with Quad and ArtWorks for Milwaukee is bringing an added splash of color to Clean Wisconsin’s fight against urban flooding.  

Read More

Expert Insights

How to Protect the Planet by Doing Nothing

Why fall is the perfect time to be lazy… for the planet.

Listen Now
Defender Episode 58: How to protect the planet by doing nothing

Latest Podcast Episode

Neonicotinoids and Human Health

Previously thought to pose no risk to humans, there is increasing evidence that neonicotinoids may have harmful health effects.

View Health Brief

Pollution & Your Health

Join the fight with Clean Wisconsin

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