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It makes sense that volcanoes would be a small fraction. Consider the population of cars and trucks in the world. Then consider how many of them are old and inefficient not so much in Australia where the age of vehicles is probably pretty young but more countries with a lesser standard of living.
I don't know what the population of vehicles is? In Australia alone it must be more than all the people when you add in trucks.
How much does a 4 litre engine pump out doing 1500rpm? (4 litres times 1500 per minute is a lot of air).
Greg.
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