>**Stratospheric aerosol injection** is a proposed method of solar geoengineering (or solar radiation modification) to reduce human-induced global warming. This would introduce aerosols into the stratosphere to create a cooling effect via global dimming, which occurs naturally from volcanic eruptions. It appears that stratospheric aerosol injection, at a moderate intensity, could counter most changes to temperature and precipitation, take effect rapidly, have low direct implementation costs, and be reversible in its direct climatic effects.
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>Various forms of sulfur were proposed as the injected substance, as this is in part how volcanic eruptions cool the planet. Precursor gases such as sulfur dioxide and hydrogen sulfide have been considered. According to estimates, “one kilogram of well placed sulfur in the stratosphere would roughly offset the warming effect of several hundred thousand kilograms of carbon dioxide.”
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>When assessing the sulfur dioxide output, the scientists concluded that the Spanish volcano was emitting seven times more gas than the EU combined.
https://en.wikipedia.org/wiki/Stratospheric_aerosol_injection
>**Stratospheric aerosol injection** is a proposed method of solar geoengineering (or solar radiation modification) to reduce human-induced global warming. This would introduce aerosols into the stratosphere to create a cooling effect via global dimming, which occurs naturally from volcanic eruptions. It appears that stratospheric aerosol injection, at a moderate intensity, could counter most changes to temperature and precipitation, take effect rapidly, have low direct implementation costs, and be reversible in its direct climatic effects.
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>Various forms of sulfur were proposed as the injected substance, as this is in part how volcanic eruptions cool the planet. Precursor gases such as sulfur dioxide and hydrogen sulfide have been considered. According to estimates, “one kilogram of well placed sulfur in the stratosphere would roughly offset the warming effect of several hundred thousand kilograms of carbon dioxide.”
Fake news. [Magma only exists underground. On the surface it’s lava.](https://www.nationalgeographic.org/encyclopedia/magma/)