A friend of mine is terrified because she believes mankind will soon be wiped out by a lack of potable water. She claims that even though we can purify water, the material costs of doing so entail causing yet more pollution. She sent this link:
http://www.youtube.com/watch?v=Ikb4WG8UJRwAnd this one:
http://www.youtube.com/watch?v=TQmz6Rbpnu0&NR=1I argued that although a couple billion unfortunates may parish, this is far from an actual existential danger to mankind due to simple supply and demand politics; if water becomes more valuable, there is funding for all sorts of technology to purify or create H2O, meaning as soon as lots of people start dying rich people who don't want to die will solve the problem. She "countered" that water shouldn't be a commodity to be bought and sold like that, but I'm not gonna start arguing down that kind of sentiment... Anyway, what is you spags' take on this? Is this really such a major future problem or is my friend just fretting over a couple of YouTube vids?