Rising methane could be a sign that Earth's climate is part-way through a 'termination-level transition'

By Euan Nisbet, Professor of Earth Sciences, Royal Holloway University of London

Since 2006, the amount of heat-trapping methane in Earth’s atmosphere has been rising fast and, unlike the rise in carbon dioxide (CO₂), methane’s recent increase seems to be driven by biological emissions, not the burning of fossil fuels. This might just be ordinary variability – a result of natural climate cycles such as El Niño. Or it may signal that a great transition in Earth’s climate has begun.

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