DISCUSSION: From what we know, chlorine was the most damaging part of CFCs. So, to figure out if a chemical would be safe, we should see whether it contains chlorine, or whether it would act like chlorine.
- Ozone is the only part that matters. Why not test for that? Other forms of oxygen wouldn’t necessarily tell us much.
- We don’t care about the lower atmosphere. The ozone layer is in the stratosphere (upper atmosphere).
- This mixes two terms. We don’t care whether something reacts with chlorine. We care whether it reacts with ozone, in the same way that chlorine does.
- CORRECT. This is important. If the new chemical also destroyed ozone like chlorine does, then that would be bad.
- This sounds like chlorine, but it’s not the real problem. Lots of things might break down under UV exposure. But the key question is whether those things destroy ozone.
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