Read MoreFriends from Oman who turn CO2 into rock and a UK firm making packaging from seaweed are among the winners.Friends from Oman who turn CO2 into rock and a UK firm making packaging from seaweed are among the winners.

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Read MoreFriends from Oman who turn CO2 into rock and a UK firm making packaging from seaweed are among the winners.Friends from Oman who turn CO2 into rock and a UK firm making packaging from seaweed are among the winners.