First is climate change, marked by a 1-degree Fahrenheit rise in average yearly temperature across the western states.

首先是气候变化，记录显示，西部各州的年平均气温上升了1华氏度。

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The air exiting the cave would be cooled by the thermal mass of the surrounding rock to within a degree or two of the yearly average temperature.

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Petersburg, solar activity is waning, so the average yearly temperature will begin to decline as well.

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