into the atmosphere than all of mankind to date, let alone 10,000 times more, is one of the most pervasive as well as one of the most demonstrably false climatological claims out there.
It stems, ultimately, from a geologist named Ian Plimer, infamous for writing a widely discredited book titled Heaven and Earth, which attempted to argue that humans have had an insignificant effect on global climate. From a fact-checking standpoint, there are no interpretations of Plimer’s second sentence that can produce a factual assertion.
One volcanic cough can do this in a day.” This brief statement — a mere 28 words — yields a remarkably dense buffet of spurious claims and outright falsehoods. All other interpretations fall well short of reality. The question is not about how much other stuff is in the atmosphere.The eruption was preceded by a two-month series of earthquakes and steam-venting episodes, caused by an injection of magma at shallow depth below the volcano that created a large bulge and a fracture system on the mountain's north slope. PDT (UTC−7) on Sunday, May 18, 1980, caused the entire weakened north face to slide away, creating the largest landslide ever recorded.This allowed the partly molten, high-pressure gas- and steam-rich rock in the volcano to suddenly explode northwards toward Spirit Lake in a hot mix of lava and pulverized older rock, overtaking the avalanching face. At the same time, snow, ice and several entire glaciers on the volcano melted, forming a series of large lahars (volcanic mudslides) that reached as far as the Columbia River, nearly 50 miles (80 km) to the southwest.In places, the vertical separation is actually very small; the new layer lying just above the stumps of the older layer.Close examination of the strata reveals typical evidence of sorting of layers, which tend to show reverse grading with the coarser material on top.During that same period, 282 Pg C were released by combustion of fossil fuels, and 5.5 additional Pg C were released to the atmosphere from cement manufacture.