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Help us fight back against the all-out assault on science & scientists.

2025 Year in Review

2025 was challenging in many ways—some we expected and others we could never have anticipated.

2025 Impact Report

We are fighting back against the flood of anti-climate and anti-science actions.

Protecting the Scientific Endeavor

Science Under Siege

The Climate Science Legal Defense Fund has fought for the scientific endeavor since 2011. Our initiatives ensure that scientists can conduct, publish, and discuss their research and advocate for science without the threat of political harassment, censorship, or legal intimidation.

2025 Impact Report

We are fighting back against the flood of anti-climate and anti-science actions.

Climate Litigation Toolkit

Our free legal resources explain the best practices for safely and effectively engaging in climate litigation and other scientific consulting work.

Updated Report: Open Records Laws

These laws, while critical to government transparency, are frequently misused by groups seeking to harass scientists and slow or halt the scientific endeavor. This report can help scientists and attorneys respond to such inquiries.

Political Action Toolkit

Our free legal resources explain the best practices for safely and effectively engaging in political advocacy.

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Our Work

We provide free legal aid and resources to researchers, educate the scientific community about their rights and responsibilities, and strengthen legal protections to promote scientific integrity.

Silencing Science Tracker

The Silencing Science Tracker is a public database that tracks government efforts to restrict, censor, undermine, and misrepresent science since the November 2016 election. To date, we have documented more than 600 attacks on science. We catalog government efforts to restrict, censor, undermine, and misrepresent science.

Safeguarding Scientific Integrity

We promote scientific integrity reforms to ensure the best available research and data inform government decision-making. And we publish resources to advance understanding of how research institutions and federal agencies approach scientific integrity — and how to strengthen legal protections for science and scientists.

Latest Resources and Activities

Scientists: Know Your Rights

The legal risks for any individual scientist are small, but there are actions you can take to protect and defend yourself, especially if you’re involved in scientific advocacy and activism.

Our Expertise in the News

Press | News The scrappy attempt to save US climate data
January 8, 2026 Politico

As the Trump administration deletes and alters critical data, scientists are pushing back. Chris Marchesano, CSLDF attorney, pointed to a fact-check created by more than 80 scientists that challenged an Energy Department report filled with inaccuracies about climate change.
Press | News All the climate info that disappeared under Trump. And how it’s being saved.
January 8, 2026 E&E News | Politico

As Trump continues his war on science, “I think it’s critically important that academics and scholars are sort of stepping up to fight back against misinformation,” said Chris Marchesano, CSLDF attorney. “It has important legal implications.”
News 2025: Our Year in Review
December 23, 2025 Dana Willbanks

2025 was challenging in many ways—some we expected and others we could never have anticipated. To meet the many challenges,…

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Double Your Impact
Make a year-end donation during our matching challenge and help us raise $20,00 to protect science.

Summer MatchHelp us fight back against the all-out assault on science & scientists.

2025 Year in Review

2025 was challenging in many ways—some we expected and others we could never have anticipated.

2025 Impact Report

We are fighting back against the flood of anti-climate and anti-science actions.

Protecting the Scientific Endeavor

Science Under Siege

The Climate Science Legal Defense Fund has fought for the scientific endeavor since 2011. Our initiatives ensure that scientists can conduct, publish, and discuss their research and advocate for science without the threat of political harassment, censorship, or legal intimidation.

2025 Impact Report

We are fighting back against the flood of anti-climate and anti-science actions.

Climate Litigation Toolkit

Our free legal resources explain the best practices for safely and effectively engaging in climate litigation and other scientific consulting work.

Updated Report: Open Records Laws

These laws, while critical to government transparency, are frequently misused by groups seeking to harass scientists and slow or halt the scientific endeavor. This report can help scientists and attorneys respond to such inquiries.

Political Action Toolkit

Our free legal resources explain the best practices for safely and effectively engaging in political advocacy.

Join Our Mailing List

Our Work

We provide free legal aid and resources to researchers, educate the scientific community about their rights and responsibilities, and strengthen legal protections to promote scientific integrity.

Silencing Science Tracker

Safeguarding Scientific Integrity

Latest Resources and Activities

Scientists: Know Your Rights

The legal risks for any individual scientist are small, but there are actions you can take to protect and defend yourself, especially if you’re involved in scientific advocacy and activism.

Our Expertise in the News

Take a Stand for Science

Double Your ImpactMake a year-end donation during our matching challenge and help us raise $20,00 to protect science.

Summer Match
Help us fight back against the all-out assault on science & scientists.

Double Your Impact
Make a year-end donation during our matching challenge and help us raise $20,00 to protect science.