Climate scientist James Hansen predicts 2026 will become the hottest year on record, surpassing 2024's current record. The prediction rests on the expected arrival of an El Niño phase in the second half of 2025, a warm ocean current pattern that raises global temperatures dramatically.
El Niño events shift warm Pacific water toward the equator, disrupting weather systems worldwide. When combined with the baseline warming from greenhouse gas emissions, these natural cycles create intense heat spikes. Hansen's forecast carries weight. The NASA climate researcher made similarly accurate predictions about 2024's record temperatures before the year ended.
The timing matters. If El Niño develops as expected, 2026 could experience sustained extreme heat across multiple continents. This threatens agriculture, infrastructure, and public health. Heat waves would likely intensify in already vulnerable regions.
Hansen's analysis suggests humanity remains on track for dangerous warming. Even as nations pledged climate action at recent conferences, emissions continue rising. The back-to-back record years demonstrate the accelerating pace of climate change rather than a temporary spike.
Researchers will monitor Pacific ocean temperatures closely through 2025 to confirm El Niño's development. The outcome will shape climate conversations heading into 2026 and influence governments' responses to warming.