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.
Very little light filters through the canopy of leaves and branches in a rain forest to reach ground level—or close to the ground—and at those levels the yellow-to-green wavelengths predominate.
After we arrived at the Xi 'an Airport, we traveled to see the terra cotta Warriors, an underground army of thousands of life-sized soldiers made from terra cotta clay.