Comment by its_ethan

I don't recall the exact specifics, but I do remember a while ago there was some outrage that Nestle was bottling some really large sounding amount of water (think ~millions of gallons a day?) from a Great Lake. The math behind how much was being used as a % of lake volume was negligible (it would take ~3,500,000 years to "drain" Michigan at that rate).

In my mind this is partly due to people not understanding large numbers, and also not understanding just how much water is actually in the Great Lakes. It's a huge amount - Lake Michigan has 1,288,000,000,000,000 gallons in it. Every human on earth could use close to 10gal of water per day for the next 50 years before Lake Michigan would be "dry", assuming it was never replenished. And that's just Lake Michigan. (Obviously environmental systems are more complicated than the simple division I did, and individual water usage isn't simply 10gal a day - it's just to demonstrate a point).

Now, someone else pointed out that the tragedy of the commons is a sort of death by a thousand cuts. And if anyone who shows up is allowed to draw millions of gallons a day, that can add up and certainly have negative effects. It's just important to actually understand the scale of the numbers involved, and to not let legitimate environmental concerns be cross-contaminated with just anti-tech-of-the-year sentiment, or political motivations, or whatever else might cloud the waters (pun unintended).