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Mass of oil capacity of a TI-class supertanker (518 million kg) is 20 x Mass of world silver production (2014) (26 million kg)
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Other land in Spain (2011) (46,000 km^2)
If this was a standard unit ...
Yes, there's now a book based on these numbers. Oxford University Press: July 2018.
Click here to learn more about it.
Click here for Podcast: Andrew Elliott interviewed for New Books Network.