Until recently many sceptics (including The Economist) doubted that wisps of cloud could be auctioned like this.

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The October sky was blue, empty but for some still wisps of cloud.

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On our first day on Maui, we took a ship-organised excursion to the steepling gorge of Iao Valley State Park, where misty wisps of cloud leant a volcanic air to the long-extinct peaks.

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