Everyday Science Our atmosphere consists of__________ CO2? Options:A. 0.03 to 0.04% CO2B. 0.3 to 0.4% CO2C. 3 to 4% CO2D. None of theseView AnswerA. 0.03 to 0.04% CO2 Continue Reading Previous: _________ means a line on a map connecting points having the same atmospheric pressure at a given time or on average over a given period.Next: What is the percentage of salt water on earth surface?