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Complex Numbers #1067394 added April 2, 2024 at 10:56am
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Sandpeople
Lots going on today, so I'll try to keep this short. It's from SciAm, and I'd find it amusing if it weren't, well, not amusing.
Good thing this didn't come up yesterday. People might think it was a prank.
He had been in Mali doing fieldwork on the drug trade when a source noted that most cannabis in Mali came from Morocco and that sand trafficking was also a major market in that country, with drug traffickers involved. “I think that when you talk about sand trafficking, most people would not believe it,” Abderrahmane says. “Me included. Now I do.”
I'm still not entirely sure I believe it.
Very few people are looking closely at the illegal sand system or calling for changes, however, because sand is a mundane resource. Yet sand mining is the world's largest extraction industry because sand is a main ingredient in concrete, and the global construction industry has been soaring for decades. Every year the world uses up to 50 billion metric tons of sand, according to a United Nations Environment Program report.
For comparison, a metric ton is slightly more than an Imperial ton, less than a shit-ton, and a lot less than a metric shit-ton.
A 2022 study by researchers at the University of Amsterdam concluded that we are dredging river sand at rates that far outstrip nature's ability to replace it, so much so that the world could run out of construction-grade sand by 2050.
Of all the things I'd expect us to run out of, sand is way down there on the list, right above human stupidity.
Sand is any hard, granular material—stones, shells, whatever—between 0.0625 and two millimeters in diameter. Fine-quality sand is used in glass, and still-finer grades appear in solar panels and silicon chips for electronics. Desert sand typically consists of grains rounded like tiny marbles from constant weathering. The best sand for construction, however, has angular grains, which helps concrete mixtures bind.
I've gone on about categorization problems in here before. This is one that has apparently been well-defined.
In case you're wondering, since "angular grains" and "diameter" appear to be mutually exclusive, sand is, in my experience, graded by successive sieves. Any grains that fit through a 2mm sieve but not a 0.0625mm sieve can qualify as "sand." Those limits are arbitrary, but useful in concrete design, with which I've had some familiarity.
There's a lot more to the article, but, as I said, I'm trying to be brief, finishing before too much sand passes through the hourglass. I don't have an answer for the problem, but it's one I'd never considered before, so I thought it was worth sharing. |
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