Loads of oxygen gas is added to the atmosphere and the oceans every minute of every day. How much oxygen is used each day by people? If you want to holler about greenhouse gas you ought to know something about the oxygen, like how much O2 is there? How much O2 is used each day and how much new O2 is made by the plants each day? Here’s how to calculate it. Use the volume of the atmosphere. The volume of a sphere is pi x 4/3 times the radius raised to the third power. The radius of the earth is 3,959 miles and the atmosphere is about 300 miles thick. The Kármán line, at 100 km (62 mi), or 1.57% of Earth’s radius, is often used as the border between the atmosphere and outer space. Go ahead. Calculate how much oxygen there is. After all if you are going to talk about the atmosphere you should know how much of it there is. Ocasio-Cortez certainly doesn’t know as she has proven time and time again.