Some think it's a no brainer: Scattering microscopic particles of sulfur into Earth's atmosphere would reduce the amount of sunlight that reaches the ground, thereby cooling the planet. Indeed, this cooling might temporarily offset the progressing climate change — but a new study claims this type of intervention is likely to have several more unwanted side effects than previously thought.

The concept of geoengineering, or human-induced alteration of the planet's climate, by stratospheric sulfur injections (SAI) is backed by nature's own phenomena. The 1991 eruption of the Philippine stratovolcano Mount Pinatubo injected nearly 20 million tons of sulfur dioxide in the stratosphere, the layer of Earth's atmosphere between altitudes of 7.6 and 31 miles (12 and 50 kilometers). The presence of

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