Climate scientists are tracking an erupting volcano on the Indonesian holiday island of Bali for clues about a possible shortcut to curb global warming by injecting sun-dimming chemicals high above the Earth.
Volcanoes are emerging as natural geoengineering labs, adding a veil of sulfur dioxide high above the planet and creating artificial sunshade to curb man-made global warming.
Ash and smoke ejected by Mount Agung, which has been erupting in recent days, has not been plentiful enough in the atmosphere to cool world temperatures. But scientists are studying what would happen if the volcano has a repeat of a far bigger eruption in 1963.