1. What is the percent increase in carbon dioxide in the atmosphere between 2015 and 2019? Between 1960 and 2015?
2. Explain the fluctuation in the carbon dioxide levels each year.

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in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

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explanation:

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