There's a rogue engineer on the loose / How much would it cost to save all endangered animals on earth? / Tepco admits responsibility for Fukushima meltdowns / Tanzania applies for permission to sell ivory stockpile / Saudi Arabia plans to go green / Russia to salvage two sunken nuclear subs / Why a four-day week could be good for you and the environment   (Photo: penelope Clay)
Businessman Russ George defends experiment seeding Pacific with iron sulphate
Guardian: World's biggest geoengineering experiment 'violates' UN rules

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