Although we can’t see it, the ozone layer is one of the most important natural barriers protecting life on Earth. It is found primarily in the stratosphere, dozens of kilometers above the surface, and its main function is to absorb much of the most harmful ultraviolet radiation coming from the sun.
In simple terms, it works like a natural filter. Without this protection, people, animals, plants, and crops would be far more exposed to UV-B radiation, which is associated with damage to the skin, eyes, and different ecosystems.
What Exactly Is Ozone?
Ozone is a gas made up of three oxygen atoms. When concentrated in the upper layers of the atmosphere, it plays a protective role, helping block between 97% and 99% of ultraviolet-B radiation.
The problem began when certain human-made gases reached this part of the atmosphere.
What Are CFCs, and Why Were They a Problem?
CFCs, or chlorofluorocarbons, were used for decades in refrigerators, air-conditioning systems, aerosols, and foams.
They seemed extremely useful, but once they reached the stratosphere, they could release chlorine and contribute to the destruction of ozone.
In 1974, scientists Mario Molina and Sherwood Rowland warned about this risk. Their research helped change the way the world understood these gases and, years later, helped drive international agreements to reduce their use.
The World Could Have Been Much Hotter
One of the most surprising facts is that protecting the ozone layer also helped slow global warming.
Scientific simulations show that if CFC levels had continued to rise unchecked, ultraviolet radiation would have seriously damaged trees, plants, and soils.
This would have reduced their ability to absorb carbon and could have resulted in 580 billion metric tons less carbon being stored in the biosphere.
The result would have been a planet with more than 2.5°C (4.5°F) of additional warming by the end of the century.
Mexico Also Played an Important Role
Mexico has eliminated around 99% of its peak consumption of ozone-depleting substances.
In 2005, the country stopped consuming CFCs and closed a major production facility. In 2014, it also eliminated the agricultural use of methyl bromide, another substance that damages the ozone layer.
The next goal is to complete the phaseout of HCFCs by 2030.
When Will the Ozone Layer Recover?
Recovery is already underway, although it will take time.
If current policies remain in place, the ozone layer is expected to return to approximately 1980 levels by 2040 across much of the planet, around 2045 in the Arctic, and close to 2066 in Antarctica.
What Can We Do to Help?
Although the biggest decisions depend on governments and industries, there are also everyday actions that can help keep this progress moving forward.
One of the most important is to properly maintain refrigerators and air-conditioning systems, since some older appliances may contain refrigerants that should not be released directly into the atmosphere.
When it’s time to dispose of one of these appliances, the best option is to take it to a specialized center or service that can properly recover and handle the refrigerant.
We can also choose more efficient appliances and technologies that use refrigerants with a lower environmental impact, as well as reduce unnecessary energy consumption.
And there is something less obvious but just as important: staying informed. The recovery of the ozone layer shows that consumer choices, regulation, and technological advances can work together when there is awareness of a problem.
The health of our planet can also be seen through much smaller signals. Butterflies, for example, can reveal important changes in ecosystems.
