Lucy Carpenter
speaker
271 appearances
1 recordings
1 series
first heard May 2026
last heard 11 May
Lucy Carpenter’s voice in public audio — every appearance, attributed to the second.
Trend
recordings per month · last 12 monthsRecordings per month over the last 12 months — 1 in all, peaking in May 2026 with 1.
Appearances
In the stratosphere, it's formed naturally from oxygen photolysis.
In the troposphere, it's from anthropogenic pollution mixing together.
From the sea level to the stratosphere.
Right.
And then you get straight into the stratosphere.
It's an air pollutant in the troposphere, but also a greenhouse gas, quite a strong greenhouse gas.
So a very simple term is ozone is bad at the surface and good in the stratosphere.
I mean, the amazing thing is only two years after the ozone hole was discovered, the Montreal Protocol was signed.
and then began the phase-out of those harmful chemicals that gave rise to the ozone hole, the chlorofluorocarbons, or CFCs, that were used in fire protection, as deodorants, as hairspray.
So once the Montreal Protocol was signed, the phase-out began, and thanks to that and the efforts of hundreds and thousands of people across the world, we are now starting to see the recovery of the ozone layer.
So it's predicted to recover back to 1980 levels by about mid-century, somewhat later in Antarctica.
So, yes...
It's a success story and has often been called the world's most successful environmental agreement.
We have basically gone from ozone-depleting gases.
The CFCs are very ozone-depleting.
Then they were replaced by the HCFCs.
They contain a hydrogen atom, so they're broken down more quickly.
So they're not as dangerous.
And then often replace them with HFCs.
And most people will have an HFC-134A, for example, in their car as their air conditioning refrigerant.
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