[WithinReason]

Also, for another bit of comparison, there's 4.5 Billion metric tons of uranium in the ocean already:

https://www.osti.gov/biblio/6191296

[teawrecks]

That number doesn't mean anything on its own. How about a ppb ratio?

[WithinReason]

The article specified the amount in absolute quantities as well instead of a ppb ratio.