A strategy consultant tries to piece together, bit by bit, how humankind has used natural resources and how we might and should use them in the future. Some scope creep is inevitable.
Striking image of how much (or little) water there is on/in the Earth. I'd guess that the sphere would be much smaller for fresh water, too (maybe 1% of the total, or between 4.5-5x smaller radius if I'm estimated cubic roots correctly).