Read a passage and then answer the questions based on it. When vegetation sprouts in the desert, it is a good sign but when the ice in the Arctic and Antarctic begins to turn green, there is something terribly wrong. Reports say that an iceberg, approximately the size of New York city, has broken off from the icy continent. An Argentine team discovered huge cracks in the polar ice caps. These developments can have serious implications. If polar ice fields melt, our coastal cities might be submerged, and sea levels across the world could rise between 3.65 and 6.09 metre in different parts of the earth. This is probably due to global warming. What can be considered as a "good sign" in the desert?

• A

  when shrubs and trees grow there
• B

  when it snows in the desert
• C

  when ice caps melt and there is water
• Correct answer
  D

  when there is vegetation found in the desert

Hence, the correct answer is option: 'D'.