Per Arthur Conan Doyle:
Just as the world has a limited supply of Oxygen and water. Both are just as
necessary as oil - even more so. Should we reduce our use of those as well?

I never thought of oxygen as being something that is consumed without
being replenished somehow - and I have never heard any credible science
reported that says anything else. Doesn't mean it's not out there...
but I have not heard anything... Has anybody else ?

But with water.....

On one hand, if my water is coming from, for instance, the Delaware
River, who cares how much I use. Worst case I'm wasting electricity
(in the water purification plants).... best case I am subsidizing the
cleanup of a major river.

OTOH, if I am a farmer draining water from an aquifer much faster than
the aquifer can replenish itself, one would think that conservation is a
good idea.
--
Pete Cresswell