ozone basic question

ENVS 210 – Ozone Basics
(5 pts) Questions – Ozone Basics:
(1pt) Why are CFCs stable in the troposphere but not stable in the stratosphere?
(1pt) What are the conditions that are required for Polar Stratospheric Clouds to exist?
The Montreal Protocol (original version 1987) bans CFCs and other compounds. It has
been modified over time and adjusted as new science guides the governing committee.
Monitoring is ongoing regarding emissions of CFCs. Below are a few questions that
point to the monitoring mission for the Montreal Protocol.
(1pt) Foundation knowledge: What are uses for CFC-11?
Read the following article about emissions of CFCs in violation of the Montreal
Protocol–
Nature 2021
https://www.nature.com/articles/d41586-021-00360-0
(2pts) See what you can find out (do a search) about why CFC-11 was used even
though it was banned by the Montreal protocol? Cite your source(s) of information.