1.

When is carbon dioxide highest

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Answer:

On MAY 9, 2013, CO2 levels in the AIR reached the level of 400 parts per MILLION (ppm). This is the first time in human history that this milestone has been passed. CO2 is the most important man-made greenhouse GAS, which means (in a simple sense) that it acts like a blanket trapping heat NEAR the surface of the Earth



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