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Some scientists claim that anthropogenic (human-produced) CO2 (carbon dioxide) lasts in the atmosphere for hundreds or even thousands of years. Of course, they also think that CO2 is the mother of all evils and, therefore, argue that the world needs to decarbonize, forget about using fossil resources (coal, oil, gas), and reduce the population from seven billion to one billion humans. Well, if that's so, the world must be suffering from CO2 exhalations by the ancient Sumerians, Egyptians, Romans, and everyone else who lived since that time. How much CO2 is in the Air? On a percentage basis, there is approximately 0.04% (or 400 ppm [parts per million]) CO2 in the air; (all numbers here are rounded to the nearest integer, just to keep things simple and not to get lost in small numerical details). Well, 0.04% does not sound like much, but when you consider the entire atmosphere, it's a lot of tiny carbon dioxide molecules. Just to give you an idea as to how many there are, we need to count all gas molecules in the air first.