East Africa’s Rift Valley was formed by shifting tectonic plates. Those geological forces may also make it possible to capture and store carbon dioxide cheaply from the air
That, at least, is the hope of James Irungu Mwangi, a Kenyan environmentalist and development expert, who talks of the opportunity that could be afforded by what he calls “the Great Carbon Valley”. The rift, he argues, has the key attributes that make it attractive for “direct air capture” stations to suck carbon dioxide from the air: renewable-energy potential and the right geology for storing carbon.plants need huge amounts of energy.
Capturing carbon dioxide is just part of the process. Next it has to be safely locked away. The rift’s geology is particularly good for this, too. A similar combination of geothermal energy and volcanic rock has already attracted companies elsewhere. Climeworks, a Swiss firm, opened the world’s biggestplant in Iceland in 2021. It can remove some 4,000 tonnes of carbon dioxide a year from the atmosphere at a cost of $600-800 a tonne.
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