💿 How CFC’s Deplete the Ozone Layer

note

This is an authentic video. Do not try to understand every word you hear.
Watch and listen for general and specific information by completing the following tasks.

Before you watch:

Exercise 1. Look at the following statements about CFCs and try to guess which are TRUE and which are FALSE.

Video

While you watch:

Exercise 2. Watch the video (till 1:20) and finish these sentences WITH NO MORE THAN TWO WORDS.

Exercise 3. Watch the video (1:21-3:20) and answer the following questions.

Exercise 4. Watch the video (3:21-till the end) and take a look at exactly how depletion of ozone happens from a chemical reaction standpoint. Complete the process.

After you watch:

Exercise 5. By how many millions of kilometers will the ozone hole shrink by 2040?

In 1989 the Montreal Protocol banned the production of ozone-depleting substances. Since then the amount of chlorine and other ozone-depleting elements in the atmosphere have been falling. Scientists estimate that chlorine levels will return to their natural state in about 50 years. By then the Antarctic ozone hole will shrink to smaller than eight million square miles.