MediumBiologyHigh School (9–10)GeneralEcology and Environment › Pollution and ConservationConceptual
Name two uses of CFCs that harmed the ozone layer…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Name two uses of CFCs that harmed the ozone layer. What did countries agree to in 1987, through the UNEP? Why do new refrigerators carry a CFC-free label today?
Need a reminder? The key ideaShow
Ozone, , forms high in the atmosphere: UV light splits into two atoms, and each atom joins an to form . The ozone layer absorbs most UV radiation, which can cause skin cancer. CFCs from refrigerants and fire extinguishers thinned it; a UNEP agreement of 1987 froze CFC production.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. The uses. CFCs were used as refrigerants and in fire extinguishers.
Step 2. The agreement. In 1987, through the UNEP, countries agreed to freeze CFC production at 1986 levels.
Step 3. The label. CFCs that leak out destroy ozone, so new refrigerators are made without them and say so.
Answer: refrigerants and fire extinguishers; a freeze on CFC production at 1986 levels; CFC-free refrigerators protect the ozone layer.
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