Step 2 A hole in the ozone layer?

It’s now 1985, and a British research team discovers a hole in the ozone layer over Antarctica. Scientists had expected a gradual depletion of the ozone, but a hole? The hole is letting through harmful ultraviolet rays. This is a serious problem. Why is it happening?

Jump to Step 3 if you want to get science on the case. If not, go home, shut the door, and pretend everything’s fine.