It is pretty clear from the geological record that periods of mountain building that exposed large areas of new basalt (Himalayas for example) are associated with reductions of atmospheric CO2. The ability of basalt to absorb and lock up CO2 is well known. The obvious question is the carbon footprint of the mining and transportation. If that were minimised, this could be a solution that could scale. Current methods, using basically diesel fuel, probably don't stack up.
Wouldn't there need to be a great deal of production to harvest the rocks, then crush them, and then distribute them? What's the carbon footprint on an operation of that scale?
"Fast-reacting silicate rocks."
So are they consumable or do they saturate or are they self-renewable? Because if they're not cyclic they're just going to have to be replaced manually and pile up somewhere as fill.
Isnt silica dust super dangerous to us?
That last sentence of the abstract:
"Finally, issues of public perception, trust and acceptance must also be addressed."
Issues of public perception against rocks? Did I miss something?
Also, I would imagine the capacity of plants to capture CO2, is greater than a rock. Do they compare CO2 removal levels in the paper?
I fail to see how it would protect against disease and pests. How would silicate rocks prevent this better than any given rock?
This smells like there's probably some good science in here, but smothered with some BS
This is how my uncle got rich. He was poor but there was no jobs so he bought the only piece of land he could afford which was rocky, all rocks. But he rented a machine to crush the rocks and planted grapes. They flourished and was blessed with success.
Not, I think, silicate so much as divalent cations such as Ca and Mg. I've proposed this scheme for many years: the Deccan traps in India have a good chemistry for carbon immobilisation. You need peasant constructed wind powered stamp mills to make paddy soil, and pay them from carbon permits granted in the industrial countries.
The paper talks about various sources of crushed silicate rocks, including basalt and silicate waste from steel and cement production, and also certain mining operations. The authors note that you have to be careful what kind of rocks you use for amendment. For example olivine absorbs a lot of CO2, but it would leave too much Ni and Cr in the soil.
Here's an interesting [article about crushed stone](https://geology.com/articles/crushed-stone/
You know what counts as silicate rocks? Phyllosilicates (from Greek φύλλον phyllon, **leaf**).
Now that's some creepy stuff right there. Purely coincidental perhaps, but creepy.
Serious question: what happens if we absorb all the co2 from the atmosphere? What will plants use?