Quote:
Originally Posted by Seemingly Useless
The hydrological cycle has no boundaries, so water that is tainted in North America will eventually mean less water for everyone in the world. Although it is true that some regions have more access to freshwater than others, the total amount of potable water remains constant. If we decrease that amount, all regions will suffer.
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The hydrological cycle does have boundaries, especially with regards to fresh water resources. You need to read a bit about hydrological catchments and hydrological basins.
Also, the amount of potable water isn't constant. The amount of fresh water may be relatively constant but much of this doesn't reach drinking water quality standards and so has to be treated to potable standards. Potable water is largely artificially produced nowadays in water treatment plants.