I don't know what the figure is, but it must be pretty low because carbon monoxide is poisonous and we don't seem to suffer too much.
1 percent of the earths atmosphere is made of the following: - Argon (0.93%) - Carbon dioxide (0.03%) - Neon> trace - Helium> trace - Methane> trace - Krypton> trace - Xenon> trace - Hydrogen> trace - Ozone> trace 21% of earths atmosphere is made of oxygen 78% of earths atmosphere is made of nitrogen
In the atmosphere, in the form of carbon dioxide
97%
nitrogen
Nitrogen makes up about 78 percent of Earth's atmosphere.
Earths atmosphere has changed in a few ways. It contains more pollutants and carbon dioxide which is a greenhouse gas.
argon
Nitrogen does
oxygen
More green plants!
A majority of the earths carbon is located in the ocean.
Argon makes up about .93 percent of the Earths atmosphere. Hope this helps! (: