UN Warns World Is “Running Out of Time,” Calls for Unified Action on Climate, Biodiversity, Pollution Crises

The world must urgently adopt a new, integrated approach to tackle climate change, biodiversity loss, land degradation, and pollution—four interlinked crises threatening global health and stability—according to a major UN report released Tuesday.

The Global Environment Outlook, produced by nearly 300 scientists from 83 countries, says decades of treating these issues separately have failed, and only coordinated policies—backed by massive investments—can prevent irreversible damage.

“You can’t think of climate change without thinking of biodiversity, land degradation, and pollution,” said lead author Bob Watson, a former NASA and UK climate scientist. “They’re all undermining our economy, our health, our food and water security, and even national security.”

A Dire Warning

The report warns that the world is nearing critical tipping points:

• Greenhouse gas emissions reached a record high in 2024.

• Current policies put the planet on track for 2.4°C warming by 2100, well above the 1.5°C Paris Agreement goal.

• Up to 40% of global land is degraded.

• More than 1 million species face extinction.

• Pollution is linked to 9 million deaths every year.

Climate change, scientists say, amplifies every other crisis—from deforestation to species loss to soil degradation.

“If we don’t fix climate change, we’re not going to be able to fix these other issues too,” said Katharine Hayhoe of Texas Tech University, who was not involved in the report.

The Cost — and the Payoff

The report estimates the world needs to invest $8 trillion annually to achieve net-zero emissions by 2050 and restore biodiversity. But beginning in 2050, the economic benefits will exceed costs—reaching:

• $20 trillion per year by 2070, and

• $100 trillion annually thereafter.

The report also urges governments to look beyond GDP, which fails to measure sustainability or long-term harm.

Political Roadblocks

Despite its urgency, scientists warn that global cooperation is faltering.

President Donald Trump withdrew the U.S. from the Paris Agreement, dismissed climate change as a hoax, rolled back renewable energy measures, and declined to participate in most environment negotiations.

At the Nairobi meeting where the report was released, the U.S. participated only on the final day and “said they didn’t agree with anything in the report,” Watson noted.

International talks on plastic pollution also collapsed this year, though a biodiversity funding push saw some success.

“Unprecedented Change” Needed

The report calls for a whole-of-government and whole-of-society transformation, involving industries, financial institutions, and citizens—along with a shift to a circular economy that treats natural resources as finite.

“We can become much more sustainable,” Watson said. “But it will take unprecedented change—and it has to happen rapidly. We are running out of time.”

Despite the political challenges, many scientists remain cautiously optimistic.

“The question isn’t whether the planet will survive,” Hayhoe said. “It’s whether human society will remain healthy and thriving. And right now, that answer is still up for grabs.”