In 2010, after the eruption of the Iceland volcanic eruption of Eyjafjallajökull, Mullikin led his team to Iceland where he met with some of the world's foremost volcanologists and geologists to better understand the degree of naturally occurring greenhouse gases being emitted.  This volcanic eruption will be remembered for causing enormous disruption to air travel across western and northern Europe in April 2010.  Mullikin climbed to the peak of an adjacent summit where he and his team witnessed first hand the fury of the eruption which emitted an estimated 150×106 kg of CO2 per day.