Finally a ray of good news concerning the environment, NASA scientists say ozone depletion is going down.
The ozone layer is a protective gas in the atmosphere that shields earth from harmful ultraviolet rays from the Sun.
This is the source of the good news.
And NASA satellite that monitors the hole in the ozone layer, which was first detected at the end of the 1970s.
That’s what we’re excited about.
It’s that we see for the first time chlorine levels are definitely going down, and ozone levels are responding to it.
Man-made chemicals called chlorofluorocarbons or CFCs left chlorine in the atmosphere that destroyed ozone molecules.
The damage from the ozone layer has been blamed for an increase in skin cancers.
Because the harmful ultraviolet radiation that gets through.
And this is the effect it has on plants.
CFCs were found in products like aerosols, pesticide sprays, packing materials and refrigerants.
They were banned globally in 1987.
NASA has released images that showed the changing ozone concentrations since the CFCs were phased out.
The Montreal Protocol has been a great success.
Once the protocol was signed in those， the regulations went into effect.
We saw at the surface levels of ozone depleting substances going down.
The scientists wonder full recovery will take decades.
Because the CFCs could remain in the atmosphere for another fifty to a hundred years.