06/08/2026
358 - Volcanic eruptions can Fight climate change
https://apple.news/AcTRgg6PkQ3G8ChtjN3yAxA
Yes, in the short term, large volcanic eruptions can temporarily counteract or “fight” aspects of human-caused climate warming by causing global cooling.
How Volcanic Eruptions Affect Climate
Volcanoes release both warming and cooling agents, but the net short-term effect of major explosive eruptions is usually cooling:
• Cooling mechanism (dominant for large eruptions): Explosive eruptions inject sulfur dioxide (SO₂) and ash high into the stratosphere. SO₂ converts to sulfuric acid aerosols that form a haze, reflecting incoming sunlight back to space (increasing Earth’s albedo). This reduces surface temperatures for 1–3 years (sometimes longer).
• Example: The 1991 Mount Pinatubo eruption (Philippines) cooled global temperatures by ~0.5–0.6°C (about 1°F) for 1–2 years.
• Example: The 1815 Mount Tambora eruption caused the “Year Without a Summer” in 1816, with widespread crop failures and cooling of ~0.4–0.8°C globally.
• Warming mechanism: Volcanoes emit CO₂ (a greenhouse gas). Over geologic timescales (millions of years), massive volcanism has contributed to warming periods. However, modern volcanic CO₂ emissions are tiny—roughly 1/60th or less of annual human emissions from fossil fuels and other activities. They are “inconsequential” for current climate trends on century scales.
The cooling effect from aerosols typically outweighs any CO₂ warming for individual large eruptions, though effects fade as particles settle out.
Key Factors and Limitations
• Only certain eruptions matter: Explosive, sulfur-rich eruptions that reach the stratosphere (especially tropical ones, which spread aerosols globally) have the biggest impact. Smaller or effusive eruptions have minimal global effects.
• Temporary and variable: Cooling lasts 1–3 years typically. It doesn’t reverse long-term warming trends driven by accumulating greenhouse gases. Multiple eruptions can influence decadal variability.
• Underestimated in models: Recent research suggests climate projections may underestimate volcanic cooling (by a factor of 2 or more), especially from smaller eruptions, adding uncertainty to near-term forecasts.
• Other effects: Aerosols can also deplete ozone, alter circulation patterns (e.g., stronger polar vortex leading to warmer winters in some regions), and interact with phenomena like El Niño.
Super-eruptions (e.g., ancient Toba) were once thought to cause catastrophic “volcanic winters,” but newer modeling suggests more modest cooling (~1.5°C max), not enough for global ecosystem collapse.
Relation to Human-Caused Climate Change
Volcanic cooling provides natural variability that can temporarily mask or slow the rate of anthropogenic warming, but it does not address the root cause: rising CO₂ and other greenhouse gases from human activities. Climate scientists use volcanic events to test models and separate natural from human influences.
Some have speculated about geoengineering (e.g., artificial stratospheric aerosols mimicking volcanoes) as a way to cool the planet, but this carries risks like ozone damage, altered precipitation, and termination shock if stopped abruptly. It’s not a substitute for emissions reductions.
In summary, volcanic eruptions can provide short-term cooling that “fights” warming effects, but they are unpredictable, temporary, and far outweighed by human emissions over the long term. For ongoing climate change, reducing fossil fuel use remains the primary solution.
Researchers analyzed satellite imagery of the volcanic plume and found evidence that the potent greenhouse gas had broken down. The work could inform artificial interventions aiming to mitigate global warming, scientists say