Potable water, arable land, rainforests, oil, gas they're going away, and they're going away soon, and unless we innovate our way out of this mess, we're going away too.

Then I found out, post exposure, that this plastic bag if I put it into a filthy puddle or a stream filled with coliforms and all sorts of disgusting stuff, that that filthy water will migrate through the wall of the bag by osmosis and end up inside it as pure, potable drinking water.