The Joker as an embryo.
If this was left unchecked, then in time, we would all be massive walking skin tumors with teeth sprouting from our arms. Seeds wouldn't even get the chance to turn into big, beautiful trees, because the second their sprouts broke the surface of the soil, they would scream for mercy as they burst into flames.
So What Happened To It?
We fixed it! Yet it's still around! And recently, the hole was the widest it had ever been!
All of that is true. While we weren't paying attention, the ozone layer was off repairing itself after it got a little push from us. Researchers determined that chlorofluorocarbons were responsible for the hole. Those were the chemicals used in air conditioners, refrigerators, and cans of aerosol spray, like the air freshener your party guests never use after taking a fragrant dump.
Go ahead, empty the whole can. You can't stop the ass fog. Nothing ever will.
The Montreal Protocol of 1987 was a global agreement to end the use of CFCs by 1996. The world complied, and the hole's been shrinking ever since. Think of it like a scab -- your mom always told you not to pick at it or it'll never heal. Same principle applies, but with the atmospheric barrier that protects us from turning into the gross burnt French fry at the bottom of the takeout bag.