This is a little bit from a science radio show I just listened to.
Quote:
James Elser: So a 400%, a four-fold increase in the amount of phosphorous is now moving in the biosphere because we're mobilising all this phosphorous from phosphorous mines into the biosphere, and of course it's running off downriver, downstream, downhill and we're deluding it back into the ocean. So the question is; how long can we do this for? The answer seems to be; not much longer. The estimates I've seen is that there might be 30 to 60 years of high grade phosphorous left in phosphorous mines.
So people are now writing articles about...you've probably heard of peak oil, now they're talking about peak phosphorous. The easy places to find phosphorous are all gone and we start to run out, and so people are starting to worry that this is ultimately going to be the limit on human sustainability, is our phosphorous supply. And in fact some people are starting to do something about it. I've read articles that in Sweden there are engineers and designers designing special urinals and toilets to separate the urine stream from the rest of the water supply to recapture the phosphorous from human urine, which I think is really ironic actually because if you look at the history of science, phosphorous was discovered in the 18th century by an alchemist who was looking for the Philosopher's Stone. And he did this, he found what he thought was the Philosopher's Stone, a glowing substance which turned out to be elemental phosphorous. He found it by collecting large amounts of urine from beer-drinking German soldiers and then heating it and evaporating it away until he got only the phosphorous left.
Robyn Williams: And that exploded.
James Elser: I don't know if it exploded, it glowed in the dark, and so phosphorous was the first element that was actually purified and discovered from human urine, and now here we are, full circle, thinking about phosphorous again and human urine seems to becoming a valuable limiting resource for the future of humanity.
Robyn Williams: You're not taking the piss are you?
James Elser: [laughs]
Robyn Williams: And no, he wasn't. James Elser is Professor of Ecology at the Arizona State University in Phoenix. One way we could save the element is by banning those white phosphorous bombs they're dropping on people in the Middle East right now.
It was about a scientist studying the effects on Stromatolites of the increase of phosphorus in the ecosystem.
It's very interesting all the things phosphorus is important for.
Full transcript or listen to the audio here:
http://www.abc.net.au/rn/scienceshow/st ... 528191.htm
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