id	keyword
hom-64	volcanic
hom-64	winter
hom-64	eruptions
hom-64	toba
hom-64	effects
hom-64	human
hom-64	rampino
hom-64	years
hom-64	climate
hom-64	analogy
hom-64	super
hom-64	self
hom-64	volcanologists
hom-64	consequences
hom-64	scientists
hom-64	earth
hom-64	ibid