Pinatubo, however, reduced global temperatures by nearly that much in a single year.

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Indeed, the eruption of Mount Pinatubo in 1991 led to just such a loss, even as it cooled the climate.

ECONOMIST: Geoengineering

Pinatubo had been dormant for more than four centuries, and in the volcanological world the mountain had become little more than a footnote.

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"We're clearly seeing a major impact on ozone depletion caused by the eruption in 1991 of Mt Pinatubo in the Philippines, " says Dr Solomon.

BBC: News | Sci/Tech | Ozone hole reaches record size

Pinatubo, a volcano on the Philippine island of Luzon, began to rumble with a series of the powerful steam explosions that typically precede an eruption.

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Nagsasa Cove was reportedly formed when Mt Pinatubo erupted in 1991.

BBC: The Philippines�� secret sanctuary

Pinatubo provided the best model in at least a century to help us understand what might happen if humans attempted to ameliorate global warming by deliberately altering the climate of the earth.

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The Stratospheric Particle Injection for Climate Engineering project, or SPICE, is a British academic consortium that seeks to mimic the actions of volcanoes like Pinatubo by pumping particles of sulfur dioxide, or similar reflective chemicals, into the stratosphere through a twelve-mile-long pipe held aloft by a balloon at one end and tethered, at the other, to a boat anchored at sea.

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