Petrify, liquefy: new ways to bury greenhouse gas
Turn greenhouse gases to stone? Transform them into a treacle-like liquid deep under the seabed? The ideas may sound like far-fetched schemes from an alchemist's notebook but scientists are pursuing them as many countries prepare to bury captured greenhouse gases in coming years as part of the fight against global warming. Analysts say the search for a suitable technology could become a $150 billion-plus market. But a big worry is that gases may leak from badly chosen underground sites, perhaps jolted open by an earthquake.