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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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Forest in Saudi Arabia (2011) (10,000 km^2)
If this was a standard unit ...
"This is a fun and riveting book. Written in an accessible and engaging way, it is unputdownable." Frost Magazine
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