An almost kilometre thick layer of clay or cap rock will lock away the CO2, just as it trapped oil and gas for millions of years, Schovsbo explains.
1L decoder, d=3, 4h/1kv, hd=2, ff=2
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Фото: Пелагия Тихонова / РИА Новости
With additional reporting from Mark Poynting, Jonah Fisher, Miho Tanaka and Tom Ingham.