19. We Blew A Hole In The Ozone Layer
The Environmental Protection Agency was created as part of the tree-hugging movement of the 1970s because people were starting to realize that we were, quite literally, destroying our planet. People were throwing old microwaves and nail polish bottles into the ocean and using entire cans of Aquanet hairspray to set their massively high hairstyles.
The 1980s were such a negative decade for the environment that we managed to create a massive hole in the ozone layer that pretty much covered the entire continent of Antarctica. Aggressive environmental-friendly policies, such as the banning of the toxic chemicals in those cans of hairspray, finally caused the hole to close.