Humanity faces a hotter world than experts forecast last year, driven by rising U.S. emissions.

The United Nations Environment Programme (UNEP) released an updated climate report showing that global warming projections have worsened due to factors including increased emissions from the United States and its formal withdrawal from the Paris Agreement. This shift threatens global climate goals and signals deeper challenges ahead.

The report reveals Earth will warm about 2.2°F (1.2°C) above current temperatures even if all countries meet their current climate commitments, which is 0.2°F (0.1°C) higher than last year’s projections. The U.S. emissions rose by 133 megatons of CO2 equivalent in 2025, accounting for a third of the global emissions increase. Experts warn this U.S. policy change alone may add nearly 0.2°F to global warming by 2100, which could contribute to exposing 140 million people to dangerously hot conditions and causing economic costs near $1.2 trillion. The report stresses the need to cut global carbon emissions by 18% by 2030 and 69% by 2040.

Looking ahead, the world must accelerate emissions reductions to avoid even more severe warming by century’s end.

Montana businesses might confront rising operational risks as climate impacts intensify, especially if national policies fail to curb emissions. The state’s reliance on energy and natural resources could make it vulnerable to shifts in regulatory and market pressures tied to global warming trends highlighted in the report.

World losing ground in fight to curb climate change, latest UN projections show
By Seth Borenstein, AP News