This one volcano alone will probably equate to any number of decades of man-made pollution.
What we do is trivial in comparison to Nature's efforts.
This is precisely why there is such a discrepancy in the figures put out about the role of motor vehicles as a pollutant.
How can 0.6% be right at the same time as the greater figure of around 35% is also true?
This event shows us. The former figure is the percentage from all pollution: the second figure is the percentage of motor vehicles within man's contribution.
This is not an argument against our derisory efforts to keep the atmosphere clean but rather, it begs for a sense of perspective and proportion.