FlyingRat wrote:global warming is not the only environmental concern out there...
This is true...I've actually had a big environmental concern since I was a teenager.
We were learning about the invention of aqueducts and plumbing, and it occurred to me.
Think of all the buildings around the world. All the plumbing in each building...the millions of sections of plumbing, all "storing" water. This is water that is NOT in our lakes, rivers, oceans. This is water NOT evaporating. This is water which is removed from "nature". And we are constantly adding more and more plumbing systems. Seems like a water "shortage" is eminent, because it's not like the earth actually makes MORE water. We don't get a supply from space. What we have is what we're always going to have. In various forms (ice, liquid, gaseous), but the more we put in the plumbing...the less options and volume available.
Add to that...since the Earth doesn't make MORE water...then the water on the Earth is the same (or technically less since we've sent some to outerspace) as has always been on Earth. The water you're drinking now...could've been drunk (and expelled) by some mongol in China...or an Egyptian in a pyramid. The idea that there's "clean" water doesn't make sense...as it's conceivable that every drop of water on the planet has been "used" by some creature, somewhere.