The ozone layer hole dominated discussions of the environment at the beginning of the twenty-first century.
When it was found in the 1980s that specific man-made substances were contributing to the thinning of the Earth's protective layer, there was an understandable worry.
However, in 2022, the topic of discourse is much more focused on climate change, and the ozone layer is barely mentioned at all.
The stratosphere is a region of the atmosphere located between six and 30 miles (9.6 and 48.2 km) above the surface of the Earth.
Most of the ozone on Earth, a colourless or pale blue gas that is essential to keeping our planet livable, is found in the stratosphere.
Without the ozone layer, which serves as a barrier against the Sun's UV radiation, there would be no life at all on Earth.