The morning of April 10, 1815, on the Indonesian island of Sumbawa, started the way most mornings had for centuries: warm, humid, unremarkable. The debris climbs past the weatherWhat made Tambora different from an ordinary large eruption is where its plume ended up. At the time, though, nobody living through the ruined harvests connected any of it to a mountain they’d never heard of. “The year without a summer” became the name people eventually gave 1816, once the connection was finally made. The people actually living it only ever got step four, with no label attached to it.