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Ancient warming episode offers clues about carbon dioxide's climate power

Original: About 304 million years ago, Earth’s average surface temperature climbed by 45.5 degrees Fahrenheit while carbon dioxide

New research points to a dramatic warming event about 304 million years ago, when Earth's average surface temperature rose by 45.5 degrees Fahrenheit as carbon dioxide levels doubled. Scientists attribute the prehistoric spike to a combination of volcanic activity, shifts in Earth's orbit, and thawing permafrost releasing further greenhouse gases. The findings are drawing attention as an analogue for understanding how carbon dioxide drives long-term climate change.

Why now: The research links a massive ancient warming event to rising carbon dioxide, resonating with current climate concerns.

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Evidence

• About 304 million years ago, Earth’s average surface temperature climbed by 45.5 degrees Fahrenheit while carbon dioxide levels doubled. Research published in August 2026 traces this prehistoric warming to a combination of volcanoes, orbital shifts, and thawing permafrost. The… · Snoro · 9

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