Could the ozone layer depletion be causing global warming?

The ozone hole is not a cause of global warming.

The ozone hole is an area in the stratosphere above Antarctica where chlorine and bromine gases from human-produced chlorofluorocarbons (CFCs) and Halons have destroyed ozone molecules and left a hole.

Global warming is the rise in average global surface temperature caused primarily by the build-up of human-produced greenhouses gases, mostly carbon dioxide and methane, which trap heat in the lower levels of the atmosphere.

There are some connections between the two phenomena.

For example, the CFCs that destroy ozone are also potent greenhouse gases, though they are considered minor players in greenhouse warming.

In fact, the ozone hole itself has a minor cooling effect (about 2% of the warming effect of greenhouses gases) because ozone in the stratosphere absorbs heat radiated to space by gases in a lower layer of Earth’s atmosphere. The loss of ozone means slightly more heat can escape into space from that region – so, if at all, the ozone hole will only mitigate global warming to a small extent.

So: While there are a few connections between the ozone hole and global warming, there is no cause-effect relationship.