The World Scientists' Warning to Humanity.

What are the Warnings?

Back in 1992 the first Warning to Humanity was issued. It was a call to action that was signed by over 1,700 scientists, including 104 Nobel laureates, from 71 countries.

There have been a further two Warnings; one in 2017, signed by 15,364 scientists from 184 countries, and a Third Warning in 2019 signed by 11,258 scientists representing 153 countries.

We use these Warnings as the scientific foundations for our climate actions, they guide what we do and drive the urgency of our demands.

We listen to the science, and we have been warned.

Our Mission View All Warnings

Scientific Consensus Milestones

A unified global call from the scientific community

28,000+ Total Signatures Combined

Special Update

A Fourth Warning to Humanity.

In November 2021, during the COP26 Climate Conference, Scientists Warning Europe issued a fourth Warning. This Warning provides a framework for climate action and is called 'Scientists' Warnings into Action'.

You can read and endorse this important paper here.

Historical Archive

Read the previous Warnings.

Download the World Scientists' Warnings to Humanity.

15,364 scientists

184 countries

Global scientific consensus update

Read Paper

11,258 scientists

153 countries

Formal declaration of emergency

Read Paper

Framework for Global Action

The six key stressors

The World Scientists' Warnings identify six interrelated areas demanding urgent coordinated action — energy, short-lived pollutants, nature preservation, food systems, human population stabilization, and economic transformation.

EnergyPollutantsNatureFoodPopulationEconomy

Explore the six key stressors

Sign the latest warning

Add your name alongside scientists, researchers, and citizens demanding urgent policy action across Europe.

Sign the latest Warning

Joined by verified scientists and climate advocates across 30+ countries