“Our idea is terrifying” — In June 1991, on the island of Luzon, Philippines, Mount Pinatubo erupted after more than 600 years of inactivity. The consequences of this event were catastrophic: 850 people dead, 8,000 houses destroyed, and a further 73,000 damaged. Over the following months, sulfuric acid droplets that came from Mount Pinatubo’s ash…