How can carbon monoxide burn holes in the atmosphere when it is heavier than the oxygen displacing it?
Carbon dioxide (CO2) and other greenhouse gases trap heat from the sun, causing Earth's temperature to rise. Carbon monoxide (CO), on the other hand, has a lower boiling point than either air or water, making it more likely to escape into the upper atmosphere where it will be absorbed by oxygen molecules. This process of CO escaping into the atmosphere causes "holes" in the ozone layer that are less protective against harmful UV radiation reaching the surface.