World leaders focus on climate at UN week as record-breaking El Niño intensifies impacts

# What happened World political leaders gathered in New York for the UN general assembly and Climate Week, which coincided this year with a record-breaking El Niño and months of extreme weather: intense heat across Europe and the US, wildfires in Africa and flash floods in Asia.

# Who spoke and what they said Australia's prime minister Anthony Albanese delivered the opening keynote, pointing to scientific forecasts that extreme weather events are becoming more frequent and intense as the planet warms. He emphasized Australia's efforts to support Pacific nations facing climate impacts.

Selwin Hart, the UN assistant secretary general for climate action, and former military officials contributed a security framing. Hart argued that conflicts such as the Iran war have reinforced the urgency to break fossil fuel dependence. Retired British army Lt Gen Richard Nugee described operational challenges as environments warm—he noted predictions that water in some seas could become too hot to cool ship engines—and suggested militaries should pursue adaptation technologies and hybridization where practical.

Miliband urged that climate and nature be incorporated into national security systems, threat assessments and contingency planning, and warned about instability linked to continued fossil fuel reliance, calling it a "fossil fuel roller coaster."

# Not covered extensively Speakers on opening day largely avoided a close critique of recent US government actions that have rolled back or blocked certain climate measures, including payments to stop offshore wind projects and moves to weaken emissions standards for vehicles and coal plants. Coverage of those policy rollbacks was limited in the opening remarks summarized at Climate Week.

# Why this matters now

# Practical implications

• Nations with resources and political consensus can make fast progress on decarbonization when they pair sustained policy with financial support for households and clear long-term plans, as Iceland's geothermal transition shows.
• Military planners and governments should assess how warming environments alter operational requirements and consider low-emission or hybrid options for suitable vehicle classes.
• International support for vulnerable countries remains a focus, with calls to scale assistance for adaptation and clean-energy transitions.

# Bottom line Climate Week's opening day emphasized climate impacts already visible worldwide and highlighted national examples of transition and adaptation. Security and economic rationales were central to calls for faster action even as some political backsliding on climate policy received limited attention in the opening remarks.