Why is enhanced weathering questionable? I don't really know much about it, but I was under the impression that carbon absorption by weathered silicates will have a dramatic impact on the planet over the very long term[1]. Is enhanced weathering just too slow, or is there more to it than that?
I've only compared it to sulphur dioxide and the risks look fewer. The other benefit of enhanced weathering with olivine distributed in energetic waters is that it removes CO2 from the ocean (letting the ocean act as a carbon sink for the atmosphere).
I'm interested in learning more about research into enhanced weathering, could you provide some recommendations?