Problem: Given the question: Panama and Ecuador are two neighboring countries. Ecuador uses nuclear fusion to produce its electricity, while Panama uses fossil fuels. Which country caused more global warming?
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The answer is:
Panama

Problem: Given the question: Guyana and Nigeria had thriving economies. Guyana's economy was based on conventional agriculture, while Nigeria attracted an enormous number of tourists to its splendid beaches each year. Which country caused more dead zones?
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The answer is:
Guyana

Problem: Given the question: Two students studied the atmosphere of Earth and other planets from our solar system. Zack learned about Earth's atmosphere, while Ken learned about the atmospheric conditions on planet Venus. Which student learned less about sulfur dioxide clouds?
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The answer is:
Zack