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The kicker for this particular method is at the end: > "Caldeira’s team wrote that its approach would be “infeasible” as a global solution. That’s because it’s
by atourgates 4y ago
The kicker for this particular method is at the end:
> "Caldeira’s team wrote that its approach would be “infeasible” as a global solution. That’s because it’s difficult to make alkaline additives without emitting CO2, he says. Heating limestone to make lime, for example, releases so much of the gas that it partially offsets the increased uptake by the ocean. Even if low-emission lime could be made, it would probably be too costly to dump into the ocean."
- bamboozled 4y agoSad...
- DennisP 4y agoThat doesn't mean it's useless though. > Caldeira and colleagues added sodium hydroxide—also known as lye and an ingredient in many soaps and detergents—to a part of Australia’s Great Barrier Reef. They found it raised pH levels nearly to preindustrial levels, allowing the natural calcification of the reef to increase.
- gs17 4y agoI'm glad to hear about this, ocean acidification does not get enough attention, which has always been weird to me since it seems to be linked to both CO2 emissions and bad things happening in ways that are much harder to deny.
- londons_explore 4y ago> releases so much of the gas that it partially offsets the increased uptake by the ocean Even that is a rather optimistic take... My Chemistry knowledge suggests it more than offsets what is taken up by the ocean...
- kortex 4y agoCost aside, it is possible to calcine limestone with green electricity, and capture the outbound CO2. As mentioned, this is still quite costly, but it's likely a hurdle we will need to cross regardless to get to green cement.
- vagabund 4y agoOlivine is readily abundant in the upper mantle and has similar decarbonizing and deacidifying effects. Theory and pilot programs suggest there's enough to completely offset the world's carbon output with relatively few mines and tropical coastlines. https://www.vesta.earth/ https://www.vesta.earth/