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Why has the world started to mine coal again? (lemmy.ml)
submitted 2 years ago* (last edited 2 years ago) by to c/asklemmy@lemmy.ml
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With climate change looming, it seems so completely backwards to go back to using it again.

Is it coal miners pushing to keep their jobs? Fear of nuclear power? Is purely politically motivated, or are there genuinely people who believe coal is clean?

Edit, I will admit I was ignorant to the usage of coal nowadays.

Now I'm more depressed than when I posted this

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[โ€“] 42 points 2 years ago (3 children)

Again? Did we stop?

It doesn't look like anyone has mentioned metallurgical coal yet. Even if you don't burn it for energy, the carbon in steel has to come from somewhere and that's usually coke, which is coal that has been further pyrolised into a fairly pure carbon producing a byproduct of coal tar.

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  • [โ€“] 5 points 2 years ago (1 child)

    Metallurgical coal only makes up for rather small part of coal mining, around 7% of all coal production goes towards it, and while the process produces more GHG than just burning it for power it has a less profound impact because it's just smaller. It's also one of the places where we can't really find an alternative, to produce steel you need to use bitumen coal because they have more carbon and less volatiles than charcoal.

    On top of that steel is extremely recyclable meaning that any steel produced can be reused pretty much 1:1 with only a small amount of energy needed.

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  • [โ€“] 2 points 2 years ago* (1 child)

    You can make really pure charcoal if you use plant fiber, like waste coconut husks. I guess it's just a cost issue?

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  • [โ€“] 3 points 2 years ago (1 child)

    More than likely it's a cost issue, coal is artificially cheap thanks to several countries subsidizing the coal industry like Germany, USA and Australia.

    There's also I guess the practical question of how much plant fiber per ton of metallurgical coal is needed, i.e. how land would be dedicated towards 'producing plant fiber' for the steel industry.

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  • [โ€“] 3 points 2 years ago*

    Coconut husks are free with the coconuts, which is why I mentioned them. Without explicitly breaking out my highschool chemistry, I'm guessing you get about a third the mass of carbon from cellulose.

    If it's a whole 7% of the coal mined, though, that is a pretty significant amount. I assume we'll have to find less agricultural ways of fixing CO2 at some point, because it is kind of a shame to use prime agricultural land to make industrial feedstock. NASA already has a device that can turn it into CO electrically, I guess.

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