A long article describing several methods and how far they have been researched. I like the enhanced rock weathering – it’s something that may be able to be done with very low use of fossil fuels. It’s not difficult to crush rock to dust. But there are pros and cons to each of the methods.
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UCLA is researching a method of removing CO2 from sea water, where it is much more concentrated than in the atmosphere. This also makes hydrogen which can be used to power the plant. Shows diagram and gives a link to research. https://abc7.com/amp/ucla-researchers-propose-removing-carbon-dioxide-ocean-climate-change/11600047/
