Al Gore was the Vice President (1993-2001), and he wrote the book/movie An Inconvenient Truth, which is sometimes watched in APES class. It tries to bring attention to the truth of global warming and climate change that people do not want to hear and therefore ignore.
This mural is also a play on the game/book 'Where's Waldo.' You can look for Al Gore (pictured at top of mural). It is also fun to look for other unexpected or unique figures, such as the white penguin with a black belly, the eskimo comparing an ice core to a penguin, the penguin wearing a shirt that says 'truth,' the penguin wearing a birthday hat, the snowman, the tiniest penguin, the eskimo falling into a crack in the ice, or the eskimo dressed as a penguin.
SPOILER ALERT: Where to find Al Gore is written (far) below if you want to know.