UNEP says a 1.5 C overshoot is likely and choices still shape the peak

What happened

A new UN Environment Programme report says global warming is likely to cross 1.5 C within the next few years. In its most optimistic assessed scenario, warming peaks at 1.8 C above preindustrial levels; other scenarios peak above 2 C. UNEP says immediate, sustained cuts to carbon dioxide and methane, paired with adaptation, can still limit how high temperatures rise and how long they remain above 1.5 C.

ACC context

UNEP says carbon dioxide removal would have to supplement, not replace, deep emissions cuts. Returning below 1.5 C would not undo every loss incurred during an overshoot.

Why it matters

Overshoot is not a new destination or permission to delay. Every additional fraction of warming and every year above 1.5 C increases risks, costs, adaptation pressure, and the chance of irreversible loss.

What to watch

• Near-term national commitments and implementation that reduce carbon dioxide and methane emissions.
• How future assessments distinguish temporary overshoot pathways from higher-warming trajectories.
• Adaptation finance and carbon-removal plans that supplement rather than replace deep emissions cuts.

Sources & evidence

• World set to cross 1.5 C global warming, but can still limit peak and adaptUN Environment Programme report release published September 2, 2026, summarizing conditional global warming and overshoot pathways.

Topics

• Global Warming
• 1.5 C
• Overshoot
• Emissions
• Adaptation