, WHO PUT THE FIRST SEISMOGRAPH ON FUEGO IN 1972 & WAS ON THE MOUNTAIN WHEN IT ERUPTED IN THE EARLY 70's. According to the U.S. Geological Survey (USGS), volcanic eruptions release sulfur dioxide into the stratosphere, which leads to global cooling by converting into sulfuric acid, which condenses and forms sulfate aerosols that reflect sulfate radiation back into space. Source. "Sulfur dioxide injected into the stratosphere by powerful eruptions reacts chemically, producing sulfur acids, which in turn form the same sulfate aerosols commonly found in vog (volcanic smog). These tiny stratospheric aerosol particles reflect sunlight (heat) energy back into space, causing cooling of the lower atmospheric layers," says Dr. Ward. Guatemala's national institute of volcanology, Insivumeh, warned people to keep away from the affected ravines as there is a possibility of "a reactivation". The institute also warned of the possibility of lahars - when water mixes with volcanic deposits forming a destructive debris flow - which could affect villages and hamlets to the south, south-west and south-east. Source. dr. peter ward is shedding light on how extreme weather events and weather patterns can change global climate.