Seriously, does nobody read any non-Gawker media around here? Pumice raft is from the Havre Seamount, per Wired: http://www.wired.com/wiredscience/2012/08/source-of-kermadec-island-pumice-raft-eruption-identified/

Actually, rocket stoves have much lower smoke and soot emissions than regular fires because they burn much more efficiently. They are on a par with gas stoves and less polluting than open fires.