This heated air, drawn down from the roof, then mixes with the greenhouse air as it reaches a second sea-water-moistened cardboard wall at the back of the greenhouse.
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Related: cardboard
Prev: The NFL charged fans$ 100 for each cardboard cutout at the game. That's a cool$ 3 million in revenue to make up for some of the lost ticket and concession sales.
Next: The gift arrived in a cardboard box.
