They proposed that tropical clouds in an atmosphere with more greenhouse gas might dry out neighbouring parts of the sky, making them more transparent to outgoing infra-red.

他们的说法是，热带云层在一个有较多温室气体的大气中，会吸走周围天空的水气，因而让这部分的天空较透明而红外线较容易往太空散射。

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Depending on individual habitats, which extend from the tropical forests of Costa Rica to Brazil, their coloring can be yellow, gold, copper, red, green, blue, or black.

它们遍布于哥斯达黎加、巴西等热带雨林中，其肤色通常为黄色、金色、铜色、红色、绿色、蓝色或黑色。

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Our eyesight would allow us to spot the red, yellow or purple fruit in the valleys and hills of a tropical garden that earth was at that time in history.

我们的视力让我们从热带花园的峡谷、高山上，一眼就可发现红黄或紫色的水果食用，历史上那个时代的整个地球都是热带花园。

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We made the journey in three 4x4 Unicef vehicles bumping along the red dirt roads through the lush green tropical landscape - trees packed with bananas, oranges and lemons.

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Pay attention to the trees and water stations throughout the sanctuary for the chance to spot six different kinds of playful hummingbird, plus red-and-blue masked trogons and a host of other tropical birds.

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