SO2 inhibits natural atmospheric cleansing---disrupts the atmosphere
Ward 9 – Ph.D. Seismology at Columbia, B.A. Geophysics at Dartmouth (Peter, “Sulfur dioxide initiates global climate change in four ways”, 2009, http://www.tetontectonics.org/Climate/Ward2009SulfurDioxide.pdf)
Volcanoes erupt large amounts of sulfur (Fig. 1) and the most chemically active gas erupted by volcanoes in significant volumes is sulfur dioxide (SO2) [21], which is readily oxidized to sulfuric acid. Sulfuric acid, “because of its low vapor pressure, quickly attaches to aerosol particles” [22]. The primary oxidant is the hydroxyl radical (OH) which is formed high in the atmosphere from ozone (O3) primarily through photodissociation in the near ultraviolent [23]. Ozone and OH are in limited supply. If large amounts of SO2 are erupted frequently enough, as will be explained in detail below, the atmosphere loses its oxidizing capacity, its ability to cleanse itself. Greenhouse gases such as water vapor, methane and carbon monoxide, and other pollutants increase, causing global warming.